So he’s (the Devil) more than happy to have someone fervently participate in Tridentine Masses or pray the Rosary daily, while that same person also breaks Communion with Christ’s vicar on earth, the pope.Wh-Wha...Where did that come from? Stupid little potshots at trads like this irritate the hell out of me. It's the insinuation that bead-counters and TLM attendees are de facto schismatics. Or at risk of schism. Novus Ordo attendees aren't immune from spiritual pride. Why not just say the devil delights in pride, especially spiritual pride? If you want to know why trads have a reputation for being angry; this is one reason why: gratuitous pot-shots from fellow Catholics.
The Rosary can never be a tool of the devil. The Devil hates the Rosary. From "The Secret of the Rosary (Twenty-Seventh Rose)":
This life is nothing but warfare and a series of temptations; we do not have to contend with enemies of flesh and blood but with the very powers of Hell. What better weapons could we possibly use to combat them than the Prayer which our great Captain taught us, and the Angelic Salutation which has chased away devils, destroyed sin and renewed the world? What better weapon could we use than meditation on the life and passion of Our Lord and Savior Jesus Christ? For, as Saint Peter says, it is with this thought we must arm ourselves in order to defend ourselves against the very same enemies which he conquered and which molest us every day."