"The see of Rome is formally vacant!"
LOL
You need to stop while you're behind. Simply because you don't understand the formal-material disctinction, that does not render it invalid. It's one of the chief distinctions employed by scholastics.
You're making a fool of yourself. Bishop Sanborn is a highly-educated and well-trained priest with many years of theology under his belt. If you have a rational argument whereby you believe he's wrong, then go ahead. But for you to denounce him as a "buffoon" from the standpoint of your untrained armchair theology demonstrates a great hubris on your part.
Bishop Guerard des Lauriers, who developed sedeprivationism, was no mere Thuc bishop. He was one of the most highly respected Thomistic theologians in the Church before Vatican II, helped Pope Pius XII write the decree on the Dogma of the Assumption, co-authored the Ottaviani Intervention, and was personal confessor to Pope Pius XII for a number of years. Disagree with him all you want, but to deride him as a buffon, you're making a first-class ass of yourself. You yourself probably haven't had a single course in scholastic theology.