It's not only libel, it's the easiest form of libel to prove. You don't have to prove malice (although it clearly exists here) or damages (less obvious). Accusing someone of being a pedo is basically as clear-cut a case as you can get for defamation and you better be able to show that you have plenty of good evidence for what you said or you're fucked. And Jake's bullshit indirect assertions wouldn't stand up anywhere.
It's too bad that, like others have said, he's probably judgement-proof
(unlike Elon Musk who was also stupid enough to pull the pedo card recently and is definitely NOT judgement-proof). It would be easy to nail Jake but it's not like he has any assets to take. Best you could likely do is hang the judgement over his head. I doubt there's a way to try and collect from his mom even though she provides the internet, although maybe if she were informed of his ways and did nothing...
It would be interesting, however, to initiate legal action even if the only useful effect were to be getting a subpoena on twitter for the identifying information of the mysterious (and presumably defamatory) "secretgamergrrl"?. Wouldn't it be enlightening to finally found out the Bruce Wayne behind our Batman? Perhaps
Jake Violet will eventually annoy someone enough that they decide to have some legal fun.
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Edit: Although looking at some of Cernovich's tweets, I don't think he should be bitching about being called a pedo on scant evidence as he seems to do that to others.