They aren't popes. They sit there, as usurpers.. but they're not valid Catholic popes. You could give them the benefit of the doubt the first time, like in the early vat 2 days where things were being sorted out, but the pattern is now hear, and certain past transgressions have been revealed to the masses.
I get what you are saying, and it makes a certain amount of sense. I'm fine with Catholics taking the SV stance, but I take exception to SV's saying that we must obey the Pope's teachings. Well, as I have tried to point out, we don't have to obey a Pope's personal teachings. Because that's not what Pope is supposed to do or have. The goofball modernist Popes teach awful things as you know, but we know better than to follow those things. And we don't have to follow those things that they teach which are against the True Faith.
We obey the timeless teachings of the Catholic Church, whether or not a Pope actually teaches them, or not. He is supposed to do that, of course, (pass on the true deposit of faith) but we STILL KNOW know what those teachings are, even if a Pope is deficient in doing his job, which of course all modernist Popes are deficient, of course.