I just googled the matter and came up with primarily kook sites making those claims and a few other sites refuting them.
After making all this noise and then coming up with exactly nothing to substantiate it, I am forced to consider whether BTM is trying to get me to give hits to neo-Nazi sites to follow his baseless assertions down the rabbit hole.
I don't see Christian sites making these claims.
I see two sets of sites: neo-Nazi sites parroting BTM's claims (or, more likely, BTM is the parrot in this analogy) and fringy atheist sites claiming that the lack of concrete Talmudic references to Jesus is proof He didn't exist.