I mean it seems clear that Meta did not pirate the content to watch/read it. However, I guess according to the ruling you could pirate anything you want (but no seeding), produce a shitty haiku based on what you pirated and then claim fair use.

No, because the downloading was considered illegal. You can use any book or movie you bought to train an LLM though.

my brother in Christ, you can pirate any stuff for any reason.