David Chalmers is Australian university educated, like myself, Dominic Hyde (metaphysics), Jerome Gauntlett (quantum field theory), and others all of the same generation - we all had the same undergraduate exposure to physics, pure applied mathematics, and can handle thermodynamics, information theory, Turing computability, and related undergraduate topics.

Chalmers specialised in pure mathematics, was broad enough to get a Rhodes Scholarship and jumped ship for being a global leader(?)(according to some) in philosophy of the mind.

Perhaps you're thinking of Dennett who was more of a biology nerd, although I see no reason to think he is incapable of grasping thermodynamics, information theory, and Turing computability given his broad autodidact tendencies.