That's what you would like to think, isn't it? I'm afraid this would be just as much true with any other kind of subjects, and as far as I know, there's no evidence either way so this is just a cheap stab you're having at them.
Meh.. I mean a lot of consulting is tasks like writing or idea generation. Using something like chat GPT to do it [faster, better] doesn't negate the value in what they do, since they are hired to do those tasks, those tasks are required for the broader work.