I just assumed with his age and having stage 4 esophageal cancer it's not looking good. But just a guess, no actual source beyond that.
After his article on the matter, I haven't seen a lot about it. His website has been quiet about it as well.
I guess all the more noble of him and not really unexpected. He's such a fucking rational/logical person he's probably overcoming so many personal feelings by seemingly ignoring the matter entirely and continuing to do what he always does: Intellectually kick ass.