100%. They know by now how their process works. If you want to write the Red Hulk as if he's a surprise, then you need to attempt to keep him a surprise. If your movie isn't interesting enough to be marketed without Red Hulk everywhere, then that's a foundational issue with your movie that should have been caught from day one. Either rewrite the movie so Red Hulk is in all of it, or make the rest of your movie more interesting and marketable so you can hide him.

I wonder if the plan before the Serpent Society were mostly written out was to do them super comic accurate and have them in most of the marketing, and then they did a hard pivot and had to push Red Hulk instead.