If you're using generative AI for concept art then yes, you DID use AI generated content in your game.
What the hell makes you think visual artists don't deserve the same respect as actors and writers?
this is sad tbh the entire concept of fantasy is based on fantastical ideas that push the human imagination to the limits and it’s rooted in the human need to escape. you are employing a robot to dream for you. if that’s not creative death idk what is