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Film Companies Seek 'Torrenting History' Related to Redditor * TorrentFreak
(torrentfreak.com)
This is a most excellent place for technology news and articles.
Unless you're using a VPN, the ISP knows, and I bet they keep the records. Even if you're using a VPN, they'll know what VPN server you connected so the feds go after them instead.
Depending on how many infringement claims they're making against OP, and I'm assuming it's a lot if they're asking for info on a specific user and not a whole sub, well, good luck OP
That's an ask for the ISP though, in this case they're asking the potential infringer who has no duty to cooperate.
They're likely asking everyone at the same time if they're serious about it.