There is no obligation (under pain of sin) to attend any particular lifeboat. We are all obligated to DO OUR BEST to KEEP THE FAITH especially if we have souls under our charge.
But the choice of which lifeboat -- which Mass/Sacraments provider to make use of -- that is left to our own wisdom and prudence.
No one, not even a lay pope on CathInfo, can bind anyone's conscience in this matter. God will judge each of us, that we did our best with what we had (what choices we had, our own particular situation). And no one knows your EXACT situation like you do. That's why we all must give our fellow Catholics the benefit of the doubt, and not try to compel their consciences under threats of mortal sin.
And yes, I believe it highly prudent to avoid Fr. Pfeiffer's cult AT ALL COSTS, as in "even if you have no other option than staying home 365 days a year and getting ZERO Masses".
Because there are worse situations, and worse fates, than having no Mass to attend. Many saints believed a bad priest was worse than no priest, for example. That's where I'm getting my opinion/thinking on this issue.
Let's put it this way: if priests with dangerous errors weren't justification for staying home on Sunday, then WHAT IN THE HECK HAVE WE TRADS BEEN DOING THIS PAST 50 YEARS? Isn't this concept the very foundation and justification for the Traditional Movement? That the Novus Ordo has destroyed souls, and so it is prudent/humble to NOT EXPOSE OURSELVES to such cunning, crafty errors that have deceived many? Wouldn't a Trad cult with a charismatic leader qualify, as much as your average Novus Ordo priest?
See, it's not just about the Mass. It's about the Faith. It's always been about the Faith.
Just like in the 90's, it was a better move to send your kids to public school than a Novus Ordo "Catholic" school. Because NO religious instruction, where your defenses are up against all the pagans, can be BETTER than being sent to a "safe" place like a "Catholic" school where they will imbibe heresy and error, where their defenses will NOT be up.