The pictures of Kerry's hand positioning while playing guitar are unmitakenly classical.
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I dunno 'bout that. It appears his left thumb is not correctly positioned on the back of the neck, rather it appears to be way over the top of the neck. Aaron Shearer never taught it that way.
The blues guys do, so they can fret the top strings with that thumb. Tres gauche to a classical player.
Dude does play classical guitar. In fact, he grows his fingernails long on his right hand for it. What a freak!
I've been known to wrap my thumb around, especially on a narrow neck guitar - and I began in classical guitar. It's the way he's holding his left wrist that clinches it for me.