Retired, I presume. Sometimes people just want to spend time with their kids and not have to work all the time. And I'm sure he talks to Sundar Pichai all the time, Alphabet/Google was his baby afterall.
If that is correct, why would you give an answer?
My query should not imply any criticism - just that I don't understand. Could you explain to an (Sincerely, From: obvious problematic person, who does want to learn)