My theory is he figured it all out a good while ago, he shows absolute proof of that with more & more frequency, but at the same time he's baked in to living a very wealthy & comfortable lifestyle in California which no doubt insulates him from the wreckage wrought by the policies he (claims) to still support & has a cushy gig making a butt-ton of money so why rock the boat.
I don't think he's a zealot, he just talks for a living & if he went full red pill that would disrupt his whole mojo... at his age what would be the point.
Either that or the residue in his brain of all the weed he's smoked has hit critical mass & he can't put the last pieces of the puzzle together