The difference with the examples you listed is that they weren’t trying to come up with ridiculous backstories before to justify Peter Pans or Dumbos existence in Disneyland because the attractions were the portal into the worlds and where disbelief needed to be suspended. They were just attractions in Fantasyland. Now they’re getting all Meta and have to justify a why a land is in a theme park. It’s stupid. They ve brought these questions on themselves.
But the criticism of the story assumed positions that the story itself dealt with. E.g., the idea that the Avengers would allow a villain to set up shop. Well, the story makes clear they've never met yet. It has been very clearly stated that the Marvel Parks Universe is not the MCU, which is also not the current state of the printed comics.