Yes, and he also makes the point quite clearly that drugs don’t make you super productive as a writer. If anything, they make your writing worse. But it’s a good excuse to live that “drugged artist” lifestyle, telling oneself that, sadly, that’s how you have to do it (while opening the next beer can).
He would probably have died of natural causes anyway by now. But just disappearing for a few decades might be a sign someone wasn’t happy with his bodily integrity? Maybe he chills below one of the Miami skyscrapers now or whatever people in his business do in such cases.