No Paul VI’s major accomplishment was promulgating Vatican II...which are the wheels that set all of this in motion.
John XXIII called Vatican II. He is reputed to have said, repeatedly, on his deathbed, “Stop the Council! Stop the Council!”
Actually, the Council itself didn’t start the rot. It was already there.
What Paul VI did, which the Council did NOT call for, was destroy the Roman Rite.
And in the first post-conciliar Synod, the bishops were shown the Novus Ordo, and they voted against it overwhelmingly. Paul’s response was to cut them out of the loop.
So the FIRST Synod was “rigged,” just like the last two.