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I know why it's called this way? I said I dislike it. Hulk (THE HULK) being treated like some sort of car and police officers ask Bruce "sir please pull over, have you smoked today?" lol. How do they even detect such stuff? To anyone it should appear just as regular Hulk. No one can see him being "piloted" by someone.
And no, I don't think they are antibodies. They look like some sort of team managing time/space travels and interventions, they even name themselves. Also there is clearly some sort of spaceship right behind them. Antibodies need no ship to travel inside a body.
(Unless Celestials have an entire system inside them, with cities and stuff, which IS possible, but I personally don't think that's the case. Don't remember anything like this in Avengers or FF comics before. Cates probably going to brush it off so yup- Hulk just murdered a bunch of superheroes we never heard about.)