No, the leader of the entire SSPX movement, Archbishop Lefebvre did.
Laying aside you're opinion of the actions of Archbishop Lefebvre, what has he got to do with this letter I posted? Did you even read it? You made charges that these gentlemen, the authors are in dissent, that they reject the authority of the pope. How have the authors done this?
The leader of the SSPX movement lack of movement into Modernism is the Holy Ghost.