I am amazed by such a statement CM.
For one who admits to being "under conversion" by the SSPX, you speak with great authority.
It is the view of those who have no faith. We know by faith that all sickness and death come into the world because of sin, and we know that the true remedy for that sickness is the Holy Sacrifice of the Mass, conversion of life, return to and reception of the sacraments in order to appease the wrath of God.
The just man lives by faith, says Holy Writ, not by merely natural prudence.
Even if one were to admit that an extraordinary threat to our life actually exists, when we look at the traditional practice of the Church in times of plague, it has never been to "halt the Mass", but rather to urge the faithful to amendment of life, penance, the reception of the sacraments, to organize public processions to appease the anger of God and beg His mercy upon us.

Here is the view of a churchman, and from a source, that may be more acceptable to someone from your background:

Ban on public Masses and the suspension of Holy Communion - go against the law of God

April 15, 2020
|
Alexandra Clark | The Daily Knight

 Archbishop Carlo Maria Viganò (LifeSite News)

In an Interview with the Remnant Newspaper, Archbishop Carlo Maria Viganò declared:
 
“The ban on public Masses and the suspension of Holy Communion - go against the law of God, and are proof that behind it all is Satan. Only the Evil Serpent can explain these measures which will bring about the spiritual loss of so many souls. It would be like ordering doctors not to treat patients in danger of death.”
 
Here are some other statements he said during the interview concerning the ban on the Sacraments and his woe to the Shepherds of the Flock:
 
How do you judge the suspension of the Sacraments which we have seen in almost all the world?
 
This is a terrible suffering, perhaps even the worst the faithful have ever seen. It is unbelievable to think such a thing has been denied to the dying.
 
At this juncture, it seems most that the Hierarchy, with very few exceptions, had no scruple in closing the churches and in preventing the participation of the faithful in the holy Sacrifice of the Mass. They have behaved like cold bureaucrats, like executors of the will of the Prince, and most of the faithful have taken their actions as a sign of their lack of Faith. Who can blame them?
 
I almost wonder - and it is a terrible thing to think - whether the closure of churches and the suspension of all Celebrations might not be another punishment by God, in addition to the pandemic. That they might know that by what things a man sinneth, by the same also he is tormented. (Wisdom 11, 17) Offended though He is by the slovenliness and lack of respect shown by his priests, outraged by the profanation of the Blessed Sacrament which occurs every day when they give Communion in the hand, and tired of silly songs or heretical homilies, He is still - from His place of silence within the Tabernacle - satisfied by the austere composed praise offered by the many Priests who are still saying the Mass of all time. The Mass which goes back to the time of the Apostles. And which has always been the beating heart of the Church down through the centuries. Let us remember this most solemn warning: God is not mocked.
 
Clearly I understand and share the basic worries about safety and protection which the authorities require for public health. However, just as they have the right to pass measures for things affecting our bodies, so the Church authorities have the right and the duty to worry about the health of our souls. They cannot deny the faithful the spiritual sustenance they receive from the Eucharist, not to mention the Sacrament of Confession, Mass, and Viaticuм.
 
When so many shops and restaurants were still open, the various Bishops’ Conferences had already suspended all sacred functions, even when the civil authorities had not asked them to do so. This is further proof that the Hierarchy is in a dreadful state and shows that Bishops are all too willing to sacrifice the well-being of souls to pacify the power of the state or the dictatorship of ideas.
 
What message would Your Excellency like to give those in charge of defending and guiding Christ’s flock?
 
The Pope, the Hierarchy, and all Bishops, Priests and Religious must immediately and absolutely convert. This is something the laity are calling for, as they suffer because they have no firm and faithful guides. We cannot allow the flock which Our Divine Lord has entrusted to our care be scattered by faithless mercenaries. We must convert and go completely over to being on God’s side. We cannot reach any compromises whatsoever with the world.
 
See Full Interview with His Excellency Here: https://remnantnewspaper.com/web/index.php/articles/item/4827-a-remnant-interview-archbishop-vigano-on-covid-19-and-the-hand-of-god

One who is a non-Catholic, "in the process of conversion", has as much authority as anyone else to teach Catholics, in this time of extraordinary crisis, what the Church teaches.
Did I read that correctly???
And the CatholicMonarchist (NonCatholicMonarchist seems more appropriate) evidently believes that he taught us "from the very sources of the Church" that the Church has the authority to "temporarily halt Mass", and disobeying such a command is "grave matter".
What extraordinary pride.
You are right on the money, Sean - TROLL HIGH ALERT.

Struthio is a Sedevacantist, if I understand him correctly. This makes him at least consistent with his position.

On the other hand, those who believe Francis is Pope yet pretty much reject everything he says have made themselves Pope and just do whatever they please. Of course they maintain so called "fidelity" to tradition, but so claims the Novus Ordite, the SSPXer, the Resister, and the Sedevacantist. But who among these is at least consistent with his or her position is the real question.

The Church has told us to stop Mass for the time being and it has authority to do so for those who believe that Francis is Pope.

CM, "The Church" did not tell us to stop the Mass, the pope did - just as other popes did when they told the same thing to Archbishop Lefebvre.
It is good that the pope used his authority to stop the sacrilegious conciliar service of V2, he should have done that years ago.

Now, I'm not sure if the Pope himself forbade Mass attendance around the world, but I'm sure that he backs the decisions of the local episcopate.  So, since the U.S. bishops have shut down Masses, those who do not consider these illegitimate are in fact bound by their decree.