Has anyone sent a message informing him of this thread or asking him to defend himself? That would be a good starting point, if he declines or whatnot, then we go from there. I'm sure he will decline to comment, but someone should at least inform him so he is aware.
He's fully aware. There is a good chance that the alleged new owner isn't quite as proficient in English, and posting via Google Translate / ChatGPT is cumbersome.