Peter M. Bietenholz
Well, he was friends with Neil's assistant, or so he claims, which is not quite the same thing. And the first time he mentions "friends", it's in quotes, so the question is how close they actually were, but this is really beside the point. I also think there was no reason to describe Neil's condition in the end. If the Peart and Rush family didn't want to disclose that, why should he?