It's problematic. In terms of prompting your own process, your final work is no less genuine, but it's the lit version of the legal "fruit of the poisonous tree".
That AI is not only replacing human art, devaluing it, it's doing so based on theft of work humans trying to make a living already created.
If you're a writer caught using AI, you're betraying your peers.
I think the point he may have been getting at is how is using an AI in that way any different than having an editor as an author? There are plenty of mainstream authors who have editors that work to trim down or adjust their works before publication. Yes, that's another human being who is credited for their work (though not always) and not all authors use them, but it's somewhat rare for anything to be published before some other person has seen it and given feedback. Some older works of literature were published as a series of weekly chapters before being compiled into a full novel and the authors would make changes based on public sentiments and feedback in some cases. To what extent can an AI substitute for other humans in any of these regards?
I'm not sure how I fully feel about it, but it's food for thought. I think to some extent it's just a more efficient way of doing the sort of things that humans are already doing. Much of literature is already people chasing trends and dumping out derivative crap to hopefully rise the wave as opposed to trying to do something new and creative, because that's rarely what people want and even if you succeed taking a chance it's only going to be met by scores of others chasing a new trend. If using AI makes the average author more successful then they'll largely replace the ones that don't use it. I'm sure there's still a market for hand knit socks, but most people want the cheap mass produced ones or can't afford the hand crafted ones if they wanted more than a pair for whatever reason.
Chemist who falls in acid will be tripping for weeks.