LOL!! "Early twenties" = "think's he's smart but he ain't."
That is evidenced by Dirksen's open sedevacantism.
Perhaps he'll complete his education and realize that he is outside the Church, and he'll come back and work within.
Quoting from the SSPX and the Remnant makes one a sedevacantist?
Oh, but he's not outside the Church. Someone schismatic must deny the authority of the pope. A sedevacantist doesn't deny papal authority, he just doubts whether the man presently claiming that office is truly the pope. There's a difference.