The guy was still in the top 10 in both pass rush win rate and run stuff win rate. He is still elite or near elite. He may or may not be at his ultimate elite form, but he is still a top DE in the league. And putting him next to Barmore and Williams and possibly Chaisson on the other side would give the Pats a top d-line in the league.
The question is what it will take to get him. But if it is reasonable, you make the trade. He would easily be the top free agent this year if he was free. All things being equal (no trade compensation, same contract), I would much rather have him then Trey Hendrickson.
Actually, the fact Hendrickson missed the entire year makes me weary of signing him.