It is almost calumny to say that the modern trad groups especially the sedevacantist ones share the same ecclesiology as Vatican 2. The Vatican 2 ecclesiology is much more catholic and orthodox then Sanborn and Fellay etc!
I think much more people in the indult crowd actually believe in EENS than dogmatic sedevacantists.
You will find many people who own Bread of Life or something else in the indult or serious Novus ordo households than in so called trad groups. Just look at what happened with Michael Voris ---almost everyone on his channel supported his videos supporting the SBC.
The modern trad group leaders are complete heretics on EENS, there is no other way to put it.