I am not familiar with the term Motarians. What does it mean?
That's an adjective derived from the term
Motu in
Motu Proprio, a reference to the docuмent released by Benedict XVI Ratzinger to (purportedly) liberate the Tridentine Mass. So I use the term as shorthand for those who attend the Tridentine Latin Mass, but only those permitted by the Conciliar Church (the so-called Diocesan "Motu" Masses, FSSP, ICK, etc.). This displaces an earlier term sometimes used by non-Conciliar-affiliated Traditional Catholics,
Indulterers, which refers to the docuмent by John Paul II which allowed bishops to permit the Tridentine Mass (before Benedict XVI), and also was a pejorative play on words for "adulterers". This really was just a sleight of hand in that JP2 said the Tridentine Mass was forbidden unless permitted, whereas Ratzinger said it was permitted unless forbidden ... both resulting in the same thing for all intents and purposes, where permission to say it was subject to the bishop ... with the sole exception that under Ratzinger's
Motu priests could offer the Tridentine Mass privately without permission. Now, again, due to the priest shortage in the Conciliar Church, it was relatively rare for priests to be able to offer Mass privately, and many of the Modernists don't even consider it licit (or even valid) for a priest to offer Mass alone (without the "community" being present and participating, since, after all, he's merely a presider, who then has no role without anyone to preside over).
So, the one benefit of Ratzinger's Motu was that when +Vigano went into hiding after exposing Bergoglio's coverup of the predators (most notably, McCarrick), he took advantage of the Motu to begin offering the Tridentine Mass, and that Mass, being the greatest teacher of the faith, converted him to Traditional Catholicism (as I had initially speculated and +Vigano himself later confirmed).