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The siutuation indeed changed when the mutual anathemas were lifted, so in that sense you can say that it is a novelty. As to the source, consider "The Special Consideration of the Eastern Churches" in Unitatis Redintegratio, as well as RESPONSES TO SOME QUESTIONS REGARDING CERTAIN ASPECTS OF THE DOCTRINE ON THE CHURCH.

With respect, you don't seem to know what you are talking about.

With all due respect, your ONE source has no basis in tradition. You’re “tradition” dates back to Vatican II. That is not Catholic.

Here’s a test for you, you can’t quote Vatican II, any Progressive Periti from Vatican II, or Vatican II pope, now, show me your teaching from a council, pope, Father of the Church or saint? If you can’t, then it’s a novelty. Very simple.

No matter how praiseworthy his actions might seem, he who is separated from the Catholic Church will never enjoy eternal life (Pope Gregory XVI)

O ye atheists who do not believe in ?God, what fools you are ! But if you do believe there is a God, you must also believe there is a true religion. And if not the Roman Catholic, which is it? Perhaps that of the pagans who admit many gods, thus they deny them all. Perhaps that of Mohammed, a religion invented by an impostor and framed for beasts rather than humans. Perhaps that of the Jews who had the true faith at one time but, because they rejected their redeemer, lost their faith, their country, their everything. Perhaps that of the heretics who, separating themselves from our Church, have confused all revealed dogmas in such a way that the belief of one heretic is contrary to that of his neighbor. O holy faith! Enlighten all those poor blind creatures who run to eternal perdition! (St. Alphonsus Liguori)