Let me summarize the core argument.
MINOR 1: Sedevacantists hold that the Vatican II ecclesiology is heretical.
MINOR 2: Sedevacantists hold that those who publicly adhere to said heresy are manifest heretics who are outside the Church.
MINOR 3: Sedevacantists who despise "Feeneyism" invariably hold the same ecclesiology that Vatican II has.
CONCLUSION: By their own critieria, Sedevacantists who despise "Feeneyism" are manifest heretics who are not Catholics and are outside the Church.
MINOR 3 is the part that needs to be proven, and I have proven it numerous times. It's never been refuted, simply ignored. Note. Here we're not speaking of those who hold a position about BoD where, essentially, a Catechumen who plans on being baptized but happens to die before being able to can be saved. That is not a heretical position. But then those who hold that position don't tend to despise "Feeneyism". I'm talking about those SVs who hold that non-Catholics can be saved, which is 90% of all BoDers. Most prominent SV clergy are on record publicly declaring that non-Catholics can be saved. It is those SV clergy and laymen that fall under their own anathema.
Here's a proof for why they (or you, if it applies to you) hold the same ecclesiology that they condemn as heretical in Vatican II.
MAJOR: There's no salvation outside the Church. de fide.
MINOR: SVs hold that various non-Catholics, Protestants, schismatics, Muslims, and Jews can be saved without converting and become Catholic before they die.
CONCLUSION: SVs hold that various non-Catholics, Protestants, schismatics, Muslims, and Jews can be in the Church without converting and becoming Catholic (since, if they can be saved, they must be in the Church somehow due to the MAJOR).
This ecclesiology in the CONCLUSION is the same ecclesiology they denounce as heretical in Vatican II.
Therefore, such Sedevacantists are manifest heretics (most are quite pertinacious) who are outside the Church and are not Catholics.
This has never been refuted, simply ignored.