I can't speak for colires but to me there is no doubt that this is Rambotnic, a prolific scammer. He has a distinct behavior and posting style very familiar to users who have interacted with him in the past. This meltdown also fits the pattern.

Whether it's worth wasting time trying to please everyone with indisputable proof when the scammer can just move on to the next account - that's a whole different issue. Rambotnic's incessant trolling every time he gets caught is basically a DOS attack on the trust system, since he's not bound by any facts or reality, and can keep demanding "evidences" indefinitely. nutildah's feedback works for anyone who cares and I doubt there's anything that could be done for those who don't.