The wrongness of your answer is self inflicted.
“Some members” do not equal “The SSPX” anymore than “some members” equal the Church at large.
The SSPX holds that the Pope is valid. The SSPX holds that all the Popes since VII are valid. They believe nothing different than that, so your last statement is just plain wrong on that level, as well as the part in there about predicting the future…for OTHER PEOPLE.
And, for the zillionth time, the “excommunications” were lifted, so apparently:
- the decision was not final
- the decision was appealed
-or-
- the decision was bogus to begin with
It’s old news and not applicable. Certainly it should not be a hindrance to accepting the SSPX as Catholics anymore than previous grievous errors committed by the Church hindering somebody from joining her. My boss has legitimate authority over me at work, but I’d be absolutely morally correct in going over his head for certain reasons, so yes…that is what LeFebvre did. Disobedience. Same with cops, parents, teachers, etc…Recognizing a legitimate authority is the only way you can be guilty of disobedience!
What you are describing is called sedevacantism. At the local level, I’ve never heard an SSPX priest speak of the Pope in the terms you describe. I’ve never heard any SSPX priest teach heresy.
Have you ever been to an SSPX mass? I assume “no” because of the priests you’ve talked to telling you they are schismatic.