Sorry, I'm thinking of Kadrey, where the court rejected Anthropic's "training" argument and provided an explanation as to how author litigants should demonstrate market harm in order to succeed on a fair use analysis, a factor that Alsup did not effectively weigh.
I suspect the market harm angle is not going to work out either based on the one study I know of on the topic: https://www.nber.org/papers/w34777
> We document a tripling in the number of new books coming to market between late 2022 and late 2025 that mirrors the use of AI that we detect in new books. The effects of this influx on consumer welfare depend on the quality of the additional books. The average quality of new books has fallen with the LLM-induced influx, and books with detected AI are substantially worse than human-authored books, so that much of the new work is of little value to consumers. Still, the LLM influx has delivered some books in the middle range of the usage/quality distribution, and the LLM-era entry process delivered seven percent more consumer surplus from books than the pre-LLM process in 2025.
...
Moreover, the arrival of LLMs does not appear to have displaced activity by incumbent authors. Despite the controversy surrounding LLMs, their effect on book consumers – like other cost-reducing technological changes in the cultural industries – is positive. However, because the new books are mostly of low quality, the effects are modest
So not only are existing authors unharmed (because most of the new competition is slop) there is even a small improvement for consumers.