It is actually something more than just novus ordo thinking, it's more like a novus ordo doctrine that the hierarchy is itself, the (indefectible) universal magisterium. The Church's magisterium has been made into a completely confused idea, it's to the point that I have only seen a very few who got it correct, most do exactly what the OP did - which would make 1) the teaching of today's NO hierarchy ("universal magisterium") true Catholic teaching - which necessarily would make 2) 2000 years of the Church's Universal Magisterium (prior to V2) all lies.
Because it would go contrary to the NO narrative, point #2 is always non-existent in this novus ordo doctrine.
Even the Wikipedia the Jew-Encyclopedia is honest enough as to recognise the second requirement, and yet most Novus Ordites aren't. However, the Magisterium refers not only to the Church's ancient teachings but also to the teaching authority of the Church and those who have it. That being the hierarchy of the Church, whom the indefectibility promise also applies to. If almost the entirety of the Church's hierarchy, including the Pope, teach heresy for decades - is that not defection? Xavier's question still stands, where is the legitimate teaching body of the Church? Does it rest in the hands of Pope Francis and his Liberal goons? Bishops in the SSPX, or the Thuc line, or... etc.