So, he has made theoretical contributions to the space, contributions to prominent private organizations in the space, and broadly educated others about the space. What more are you looking for?
People just get bored and go do something else for a while sometimes. Or he's got some beef.
Me changing can never be used as an appraisal of my old organisation so.
Disclaimer: regarding money, if I get enough in max a year to rezire forever after that, I might be tempted. Which won't happen, because a) I'd just leave a year later anyway and b) nobody would pay me high 7 figures just to not quit.
Agree he had a decent overall track record at Stanford, but that’s not how tenure works — it might have got his foot in the door as an assistant professor somewhere. He chose a much more lucrative path.