I get that the youtuber just wanted no trouble, but he may have really screwed himself by not insisting on a waver of liability, agreement that the existing videos can stay up (or, alternatively, compensation to replace the lost income from them), and compensation for his costs at a minimum. Handing WOTC's paid thugs the material probably didn't do anything to reduce his risk and took away the little leverage he had…
There is no law being broken so it does not matter what he said or did.