Even if 99% of generations are trash, why does that matter? Just throw out the failures and keep the good ones, like any writer.
Here is the text of the winning story: https://granta.com/the-serpent-in-the-grove/ If you've ever used ChatGPT to generate stories, you will find the style unmistakable. It's cloying to me, but it did manage to fool some stuffy literary judges.