After all that, I forgot to answer the OP.
It seems to me that you generally can't rely on what the
devil says. But when he is being exorcized, the devil can
be required to speak the truth, under the authority of
Jesus Christ. The devil hates it when that happens.
Curiously, there is one other time that you can pay close
attention to what the devil says, and that is in regards
to the Blessed Sacrament, for the devil knows when a
host or wine is validly consecrated. The devil is able to
"see" or sense the presence of God incarnate. It is a
bit mysterious that he was not able to do so when Jesus
walked the earth, but that was something that Our Lord
hid from him at the time, and it was only at the moment
that Jesus had died on the Cross that the devil suddenly
realized that he had been defeated.
The movie The Passion of the Christ
depicts that scene, but it could be even more dramatically
displayed. At the Final Judgment we will all be shown the
REAL movie, and that, you can be assured, will be the
blockbuster of all time, literally.
Like I said, I think I remember two priests saying that the Novus Ordo Mass was not valid. I am not certain, so I am trying to clarify. Has that position ever been taken by the Society or has the Society always held that the Novus Ordo Mass is valid, just inferior?
But what I wanted to say is, that when a satanist goes
out to get a host to use at a Black Mass, one where they
will not have a valid priest to do the consecration, but
one where they will have all or many of the other terrible
things they do to desecrate the host, they always look
for a host that was consecrated at a Traditional Latin
Mass, rather than at a NovusOrdo Newmass. And this is
rather curious, especially due to the fact that when the
hosts are distributed in the hand, like Pope Francis is
wont to do, the recipient can most easily just pretend to
put it in his mouth, but actually conceal it in his hand and
then tuck it away in a pocket or a pouch to be abused,
later, like a spider that stores away prey wrapped in
spider web, not quite dead but lightly poisoned, so as
to be available for "snacking." The Japanese did that
with POWs in WWII - they would cut off an arm or a
leg or a pound of flesh, which they would then eat,
because they were starving on a remote island, and they
kept American prisoners as victims to cannibalize.
It is much more difficult to receive a host on the tongue
and then find a place to hide where he can remove it from
his mouth without being noticed, so it can be used later.
I have been at several Masses where I have seen
someone do just this. And in all cases they were people
who had a kind of sinister look about them, with shifty
eyes, and abrupt movements, that made them appear
to be trying to hide their true behavior that they would
like to do.
There was a recent news story where certain people in
the Vatican were found out selling consecrated hosts to
satanists, and the greatest demand is for hosts that are
from TLMs, not from Newmasses.
I had received it on good authority that satanists practice
a kind of game, where they place a lot of hosts out on
a table, in apparently random positions, perhaps a
hundred or more of them, of varying sizes and patterns
on their surface. Then a person enters the room, usually
a woman who claims to be a witch, and her job is to
seek out the one host that is "real" - that is, validly
consecrated by a real priest. Any actual witch will be able
to do this, and the reason is, she will not be able to bear
being "In the presence of He Who Is."
And for that ritual, they always strive to get a host from
a TLM, not from a Newmass, because when they use a
host from a Newmass, sometimes the witch can't 'find' it.