My main point is contained here:
Another highly important and sometimes overlooked prerogative of the local Roman Church is its infallibility. By reason of its peculiar place in the universal Church militant, this individual congregation has always been and will always be protected from corporate heresy by God's providential power. The local Church of Rome, with its bishop, its presbyterium, its clergy and its laity will exist until the end of time secure in the purity of its faith. St. Cyprian alluded to this charism when he spoke of the Catholic Romans as those "ad quos perfidia habere non potest accessum."[32]
This infallibility, not only of the Roman Pontiff, but also of the local Church of Rome, was a central theme in the ecclesiology of some of the greatest Counter-Reformation theologians. Cardinal Hosius proposed this thesis in his polemic against Brentius.[33] John Driedo developed it magnificently.[34] St. Robert explained this teaching by saying that the Roman clergy and the Roman laity, as a corporate unit, could never fall away from the faith.[35] The Roman Church, as an individual local institution, can never fall away from the faith. Manifestly the same guarantee is given to no other local Church.
It is interesting to note that during the prolonged vacancy of the Roman See the presbyters and the deacons of Rome wrote to St. Cyprian in such a way as to manifest their conviction that the faith of their own local Church, even during this interregnum, constituted a norm to which the faith of other local Churches was meant to conform.[36] The Roman Church could not possibly be the one with which all the other local congregations of Christendom must agree were it not endowed with a special infallibility. In order to be effective that infallibility must be acknowledged in a very practical manner by the other local units of the Church militant throughout the world.
In short, we can form a syllogism as follows:
Major: The local Church of the city of Rome as a corporate unit can never fall away from the faith.
Minor: The local Church of the city of Rome, as a corporate unit, accepted the Novus Ordo Missae in 1970.
Conclusion: Acceptance of the Novus Ordo Missae does not constitute falling away from the faith.
"scholastic theology points to the common Catholic teaching that the local Church of Rome, the faithful of the Eternal City presided over by their Bishop who is surrounded by his own priests and other clerics, as an infallible and indefectible institution..."
Where has scholastic theology ever stated that it is a "common Catholic teaching" that the local Church of Rome is infallible and indefectible? That is unmitigated bull. The Bishop of Rome is infallible under certain very constrained conditions. And the Catholic Church IN TOTO is indefectible--insofar as it is the Mystical Body of Christ. But it has never been Catholic doctrine that the LOCAL Church of Rome is either infallible or indefectible. Saying so is laughable since the present local church of Rome is as messed up as the thousands of other local Catholic churches around the globe. It most certainly does not exist anywhere in tandem with the Novus Ordo.