You assembled a bunch of references that made no sense. Nonsense. So of course you losing the argument in substance and logical order. I’ll stop going back to it and confuse you further.
Of course there’s a place called Avengers Assemble. It’s where they assembled in comics, movies (MCU), television series, and the so-called Avengers Campus. Was there a place called Avengers Campus before in Marvel Canon? Stark Tower, YES. Where else? Obviously they could assemble in whatever facility they had before. It should still be called Avengers Assemble.
The narrative was broken when Disney had the genius to make up alternate universes and multiverses. It would be fixed by having Avengers Assemble that harkens back to when Avengers originated. Then any stories could branch off whatever way they want or not. Disney actually isn’t doing new stories. They are selling Ironman Infinity Gauntlets. Thanos’ Snap still happened, but we at least still get to see Ironman.