There's actually legitimate grounds to disagree with the Dimond Brothers on some points, and I've expressed my disgreements ... but this is an absolute waste of time and a nothingburger, as another poster put it.

NO TRAD RELIGIOUS is the "genuine article".  Yet we Traditional Catholics all recognized the irregularity of this position and treat the Traditional Religous with the respect they deserve, calling the Sisters, Brothers, etc. because they are such in the eyes of God much more than any Novus Ordo heretic clown who happened to be "official".

No, he has an anti-sede obsession, to the point of it having caused deep psychological problems for the guy, and mental imbalance.

It's not an obsession, it is a matter of faith. 

  When you use the term "matter of faith" you are saying it's a matter of doctrine.  But it's not.  It's a theological problem that has yet to be settled.

 No, it is a matter of faith. You are saying it's a matter of doctrine. But it's not. If it were, there would be a doctrine that teaches sedeism.  

"The pope problem" is a part of their faith for sedes. It's why they separate themselves from other trads, it's why they form their own trad communities, their own chapels, their own schools, their own seminaries etc. It is a matter of faith.

That comment is rich indeed. And just how is that any different from what the SSPX did, and the Resistance then did after that?

Those splits had and have nothing to do with popes.