Well, as someone else pointed out earlier in this thread, he is still maintaining an active eBay store:
https://www.ebay.com/usr/edgewound0z15
There are new feedbacks that are less than a month old, so these aren't simply abandoned listings that are set to auto-renew. He is still selling stuff. He hasn't simply disappeared. Nothing wrong with a wellness check of course, but it really does sound like he is just ghosting people (ignoring people who he doesn't have a convenient response for) at this point.