Here’s the link to a Patheos post by Scott Eric Alt. It’s a good read. He explains what Taylor Marshall is claiming about the Popes and the Church.
Scott Alt concludes: “For Marshall does not just attack Pope Francis; he attacks every prior pope back to and even including Pius XII. This says to Catholics that we can not trust the Church or the successors of the apostles, but that we must trust “red-pilled” social media figures to tell us the truth and interpret doctrine correctly. That’s not what Christ wanted for his Church.”
My take is more stark. By rejecting the Popes going back to Pius XII and Vatican II, and their teachings, Taylor Marshall commits schism and heresy. By casting doubt and expressing dissent so extensively, he destroys the faith more extensively than most heresies. And then he claims that has been “infiltrated all the way to the top” by Satan. This constitutes apostasy, since no reasonable person with a good conscience should adhere to religion which has be infiltrated by the devil all the way to the top. Marshall has rejected the Christian faith itself. And then, since the Church is the body of Christ, with the Holy Spirit as Her Soul, and Christ as Her Head, such a claim is blasphemy against the Holy Spirit and against Christ.