Reading about those older posts about Peterson's health issues, I can't help but feel he might have subjected himself to a lot of quackery. Why would an extremely wealthy Canadian/American go to an anesthesiologist in Serbia?
Most "unique" doctors that may be worth travelling very far are highly specialized surgeons who are very good in areas (sports orthopaedics, etc), I can't imagine what an anesthesiologist would do that it's so unique.
You would be correct given that he and his daughter embraced the Carnivore diet at one point.