The liner notes from his three-disc anthology ask you to kindly pass rumors like that on to the IRS.
He just gave the whole gig up and adamantly refused to be pulled out of musical retirement. A couple of times a group I was involved with back in school (long time ago) got a professor who knew him very well to try to get him to do a concert but no dice.
Sorry! I just used their headline and didn't add anything.
That's the normative thing to do in HN, so it's their fault, basically