Nobody cares about Fr. Cekada’s “lay pope.” Explain to us how NFP does not subordinate the primary end of marriage to the secondary end.
1. I won't be drawn into a debate with you on the subject. I'm simply not interested.
2. You completely miss the point. My point is that every "lay pope" thinks it's so simple, reduced to one angle, reduced to one aspect or point, that their mind sees as "100% crystal clear" and they proceed to push it on others as if it were dogma. And consequently, their opponents who go against this "dogma" are heretics, bad-willed, evil, etc.
That is why such debates by uneducated laymen is so problematic. Each side has a single argument they think is a slam-dunk, mic-drop, "case closed" -- but nevertheless, BOTH SIDES can earnestly and honestly argue about it forever, each convinced that he's right.
For Ladislaus, the "mic drop" argument for Sedevacantism is "A pope can't promulgate a noxious doctrine/Mass". But his opponents are usually focusing on ANOTHER point, which totally DIS-favors sedevacantism.
If you need guidance on this moral issue, see a Traditional Catholic priest. Don't waste your time with Joe Sixpack arguing on some forum from his armchair.