My bad…hit to many X’s.
You ask about the point
The point of posts generally fall into two categories (generally). The first is where people are seeking information. The person posts and then various people try to assist with answers. The second type (and please remember that these are simply broad generalizations) are posts of general interest to the poster and possibly others that become the source of discussion.
This post falls more into the second category. When I first came across these links I as an academic found them fascinating both in terms of the odd ball types like Pulvermacher who call him self Pope and in terms of the Sedevacantist movement and traditionalism in a more general sense. The politics and rationale of it are interesting. You have (as you can see from the list) some rather sincere tradtionalist groups (fringe though they may be). I would not include Pulvermacher or Pope Michael in that category.
Schismatic groups that are non Catholic (ie non Roman Catholic) have caused considerable questions among Catholics. I recall on going irritation in a book I have of questions between a reader who was angry at a Catholic Priest for asserting that the Lefebvre group was schismatic and that taking sacaraments there was a sin.
Hope that helps and welcome to the forum and the world of posting. I look forward to your particpation.