The guy had practically unlimited money. He could have paid a world class doctor to clean his bathroom every week while giving health advice and playing the guitar at the same time.
I know people who are well off, have serious health issues and spend a lot of effort to go to doctors who are experts in their fields. I’d say part of the problem is that most doctors are really bad with humans.
I call it the engineer disease. Good to know that other fields have it as well…