AI novels are still very generic and easily to notice. The language, the slip ups, you can smell the robot.
While AI is getting better, for now, I have yet to read a good quality AI novel that is not utterly predictable and disgustingly uninspired.
In the first place, I doubt that the simple large language models tech bros sell as "AI" are capable of producing consistent stories without considerable human assistance. They are not intelligent, after all.
Humans using AI to write novels? Why not