My experience is that he gradually started delaying answers (and not answering to most of the questions), then reading my PMs and not answering if I didn't send a second PM, then not answered at all, while being online here.
Also, I can see his onedrive link has been updated several days after my last (not replied) PMs, so I really think it's irresponsible behavior from his side. Hell, bad things can happen to anyone, but if you've been online is it that terrible to take 10 seconds to reply to a PM saying "bad things happened, I'm postponing the sale"? It's just sad and irresponsible in my opinion for the reasons mentioned.
Sorry if it's prohibited to write these things in public but I really wanted to warn other possible buyers for my experience so far so that they don't expect much.