To be fair, he just said "it would be great if FJ chimed in".

I don't see how OP could provide any proof: if he's lying (historically, the most likely scenario), he'll just repeat that the accusations are baseless. If he's telling the truth, there's not much he can do to prove it, either.

The only ones able to provide clarity are FJ, and if they choose to, they'll probably post information on IP address, browser timestamps etc which will convince anyone with half a brain that the accusations here are baseless. If they don't, however, I don't see how this thread can become anything else than a waste of time.