According to Colossal (that clown from the Baited podcast), it's from a former friend of Ethan who he cannot name, but Keem says it was Frank in chat and Clown backs this up.
colossal.mp4
Credit to Gokunaru's video on h3h3 called, "The Death of h3h3production". Highly recommend checking it out, it really shows how scummy, insufferable and pathetic h3h3 is.
Also, on a related note, this "joke" he did on Elon, he used to do it before. Gokunaru explains perfectly how Ethan tricks his audience to believe what he's saying, but at the same time, avoid criticism or any consequence from making such accusation by saying it was for the lulz, essentially saying it was just a joke. I, unfortunately, can't put the damn mp4 because it keeps giving me errors, but if you're interested, then here's the timestamp for it: 1:02:19