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.
It is entirely proper to refer to Vatican II documents to define the Catholic teaching on ecumenism with the East since the lifting of the anaphemas that reversed the previously schismatic course of Eastern Orthodoxy occurred recently. Thia is what Church councils are for: to steer the Church in light of latter-day developments.
I was baptised Russian Orthodox and switched to the Roman Rite of the Catholic Church in 1994, where I happily am to this day. I believe that all that the Holy Catholic Church teaches, confesses and proclaims is inspired by God.
Now, are you Catholic? It is not every day that I meet one who believes that her church "speaks with a forked tongue" and remains in it.