I think it's outrageously unjust for CMTV's representatives to make such statements about Society Masses, contradicted both by reason and by Rome.
Here's what Rome said about the possibility of attending and financially supporting Society Masses.
In the strict sense you may fulfill your Sunday obligation by attending a Mass celebrated by a priest of the Society of Saint Pius X ... a modest contribution to the collection at mass could be justified
Since you mentioned confessions,
Then there are painful cases that concern sins so severe they are penalized by excommunication reserved only to the Pope.
SSPX priests who confront these cases in the confessional absolve the penitent from the sin, and from the excommunication. According to Church policy, the priest must then send the case to Rome to be examined, and the excommunication formally lifted.
Bishop Fellay says, “Every time – absolutely every time – we have received an answer from Rome that the priest who took care of this confession did well, that it was perfectly in order, and it was both licit and valid.” Rome would then comment on the penance, whether it was sufficient or not enough.
In other words, Rome does not say the confession was invalid. Rome accepts the validity of the SSPX confession.
I think Mr. Voris is a good and convincing speaker and presenter and often offers persuasive facts and arguments and plays a positive role in informing Catholics about problems in the Church today and the way to resolving them. He's also right not to attack the Vicar of Christ or treat him as if were on par with just any other cleric or bishop. He should continue doing that.
All the same, every Catholic who loves and attends the TLM owes a great deal to Archbishop Lefebvre, Bishop Fellay and the Society and should recognize that. Just leave the Society alone if you disagree with them, it's not as if they don't recognize the Roman Church or the Pope and his authority, and in fact Rome has already promised them a canonical structure, possibly a personal prelature or apostolic administration with more or less independence from diocesan Bishops, once the doctrinal questions are sorted out, and if they hadn't insisted on the doctrinal discussions, they would already have it. There are far bigger problems in the mainstream Church as the Roman authorities recognize and, as Bishop Fellay said, it is by properly and fully solving those problems that the "problem of the Society" will cease to be such.