While the BitTorrent angle is not new, the authors previously only included a ‘distribution’ claim based on direct copyright infringement. This claim has a higher evidence standard, as it typically requires evidence that the infringer shares a whole work with a third party.
Since BitTorrent transfers break up files into smaller chunks before they are shared, it might be difficult to prove that a whole work is shared.
If the case sides with Meta, I can see future defenses pouring in "Ya, see your honor - I'm innocent cause I only seeded 99.99% of that movie."