The photos he posted showing post-surgical wound dehiscence, granulation, and hypergranulation were believable to me and convincingly his own. The wound pix are AWFUL and NSFW. Don't complain if you click anyway.
Archive
I also believe the claim he filed against the Vancouver Coastal Health Authority recounts his crotch's recent history as of Feb 2021, albeit with Yanivian drama.
MM archive
Plus various tweets from the MM neighbor brigade noted him leaving the strata with luggage on Jan 10, 2021; surgery scheduled for Jan 11 or 12; and Yaniv's own tweet on Jan 12 saying he'd be offline for a while.
There's also MM's confirmation that Yaniv was checked into the Laval Holiday Inn on Jan 10. The hotel's a few minutes from the Montreal clinic where the surgery was to be performed and was often used for out-of-town patients for a night or two after surgery.
MM article; pix Yaniv posted from inside the hotel,
MM
The neighbors brigade also posted that EMTs called to the strata a couple of weeks after the surgery were heard discussing his his infected surgical site and seeing visible encrusted urine.
Archive
I'm not convinced the neighbors' claims about how they got information are truthful - overheard, saw mail, observed his movements - but I think the information was itself was pretty solid. The dodge about their sources was, I think, to protect a catfish (not Sara) so that Yaniv would continue confiding in her.