yet all the teaching during those times was protected by infallibility.
"all" teaching? So no error could be taught by any Church members?
No error can be taught by the Pope teaching in union with the Bishops of the world, in other words, by the Ordinary Universal Magisterium which is infallible.
Individual Church members can get things wrong from time to time. But when the Pope teaches in union with the Bishops of the world, that teaching is guaranteed by Heaven to be free of error.
Then you believe the Novus Ordo is free from error. Why not admit already that you do not understand what you are saying?
To be nit picky, Infallibility means guaranteed to be without the possibility of error.
It is you who doesn't understand what you are saying. But you have highlighted the issue there nevertheless.
Popes cannot teach error through one of the organs of infallibility of the Church because such teachings are guaranteed by Heaven to be free of error.
The Ordinary Universal Magisterium, which consists of the Pope teaching in union with the Bishops of the world, is one of the organs of infallibility of the Church. It cannot teach error.
But the Conciliar popes have been teaching the errors of Vatican II in union with the bishops of the world for nearly fifty years.
Therefore the Conciliar popes do not have the facility of infallibility. If the Conciliar popes were true popes, Vatican II would form part of the teaching of the Ordinary Universal Magisterium of the Church and would be guaranteed by heaven to be free of error.
Since this is impossible, the only conclusion is that the Conciliar popes are not Popes.