Homecoming had him nicknamed "Iron-Boy" for a reason
By who? Certainly not the general audience. This is just as reductive as EFAP shit. How does the presence of Iron Man and his influence detract from the movie's themes? How does it detract from its quality? It doesn't in either case.
Far From Home had a lot of shilling for Captain Marvel on top of selling Tony's death
Just as reductive as before. I didn't see Captain Marvel being marketed at all in that one. And "selling Tony's death"? What exactly do you mean by that? If your goal is to argue that MauLer has no objective standards for ignoring the flaws of these movies, why not bring up actual flaws? For instance, in FFH, the notion that Mysterio's story about Spider-Man doing anything wrong would be believed is ridiculous because of the mountains of evidence proving the contrary. And iirc, the footage of Mysterio at the end contradicts what we saw in the scene where it was supposedly recorded. There's many more issues, but it's connection to other MCU products isn't one of them.
No Way Home set up the multi-verse because let's face it, the MCU played its best card(s) but wants to keep going
Again, thoroughly reductive, and even just untrue. Loki set up the multi-verse, No Way Home was the first movie to make use of it. From a meta perspective it was probably done just to bring in Toby and Andrew, sure, but that's not inherently a problem. How it goes about bringing them into the film and making use of the multi-verse idea is where the problem comes from.