Fr. Pfeiffer is a sedevacantist; he just protests too much that he isn't.
But so much about him SCREAMS sedevacantist. And in practice, many of his "faithful" end up going to sedevacantist chapels when they can't wait any longer for Fr. Pfeiffer to show up for another Mass.
Actions speak louder than words.
- Attack Bishop Williamson and his classic SSPX position? Check.
- Simplistic view on the New Mass? Check.
- Bitter zeal? Check.
- Obsession with those to the "left" of him (which is just about everyone)? Check.
- Obsession with personalities rather than doctrine? Check.
- Isolation of his flock, telling them to red-light 99% of Traditional Masses? Check.*
* That last item isn't even typical of Sedevacantists, but more like radical, extreme Sedevacantists -- probably less than 5% of the Sede population.
With all due respect to the "good" or "sane" sedevacantists on CathInfo, these really are traits I've seen again and again in the Sedevacantist movement. The downside risks of being in that movement, if you will.
Remember that no solution to the Crisis is perfect -- aside from the Pope converting back to the Faith, demolishing everything after Vatican II, and restoring the Church, that is!