This is just untrue.
There's a lot of money in claiming it's true, with varying levels of hedging and insincerity, but AI writing follows the pattern of AI everything else: if you're not competent to judge quality, then you think it is high quality.
Not because they didn't think the writing was high quality. The quality of the writing is what led to the bidding war. The advance was retracted because the publisher can't get exclusivity if copyright protections don't hold due to the novel being AI generated.
- Countless poorly-written AI books released
- Many, many articles saying that people should stop complaining and AI writing is just as good