So let me get this straight. He's started a "defamation law suit" on people who have put videos out there and he's not watched them?
I think he is saying that he won't provide specifics in an online comment, but via his legal team through a civil suit. I don't know how much information the plaintiff in a civil suit is required to give to the defendant, but they do need to make their case in court at some point. But -total hypothetical here *cough*- if you don't really have a case, you can string people along with "hints" and threats until they finally realize that you're not actually going to file anything. If the person you're lying to isn't savvy, it can be a very effective intimidation tactic.
Or, if they realize that you can't really do anything to them, they can crank up the mockery to eleven and make you wish you hadn't tried to be so clever. And then the threats and sly comments just make you look like a clown.