While he said it was basically fully hollow, my guess is that it's just mostly chambered if you take a semi-hollow body and add the larger control cavity route for the piezo electronics.
A semi-hollow is essentially a heavily chambered solid body, with solid wood through the center from tailpiece to neck, fully surrounding the control cavity, and between the controls and lower bout. The hollow-bodies are a mahogany body outline with a carved/arched maple top
and back, with a solid mahogany "post" at the bridge/tailpiece. I've seen pictures of this, but Google image search doesn't like me today.
IME, the semi-hollows stay warm and "snappy" but have some extra woodiness and air. The hollow-bodies are sort of the reverse; acoustic and woody with added solidity from the center post. The semi-hollows are definitely a middle-ground between the solid- and hollow-bodies, due to the significantly different back construction between all three.
Then there's all the way to Gretch where there's no center block, floating bridge, etc... but meh.
EDIT: Found one of the images I remember, of a hollowbody..