There is a bit of a goomba fallacy going on, not everyone who is anti-AI is against it for the same reason. But from my own experience, I find people who are against it for reasons of it devaluing their labor also tend to take the view that it doesn't really work, but this latter half tends to be a bit of motivated reasoning (in the general trend that if you are against something you will be more inclined to believe every argument that it is bad even if some of those arguments are pretty weak).