Struthio is a Sedevacantist, if I understand him correctly. This makes him at least consistent with his position.
On the other hand, those who believe Francis is Pope yet pretty much reject everything he says have made themselves Pope and just do whatever they please. Of course they maintain so called "fidelity" to tradition, but so claims the Novus Ordite, the SSPXer, the Resister, and the Sedevacantist. But who among these is at least consistent with his or her position is the real question.
The Church has told us to stop Mass for the time being and it has authority to do so for those who believe that Francis is Pope.