I thought they explicitly weren't. See http://beebulletin.com/hilarious-pirate-bay-legal-responses/, or https://torrentfreak.com/completely-ignoring-the-dmca-an-opt... (from earlier this year) "The Pirate Bay has refused to take anything down on copyright grounds from day one and yet it remains up today."
Is there any other indication that TPB has begun obeying DMCA requests, or are they lying?