(nods) Fair enough... that sure does sound like it's saying what you understand it to be saying.

I can imagine ways to rescue that quote by taking very strict interpretations of "simple surgical procedure," I guess. E.g., maybe a simple surgical procedure can't enhance intelligence, any more than simple mathematics can predict trajectories in atmosphere, fine, but I can't see why that's an interesting question. But I'm really uninterested in exegesis, let alone eisegesis.

For my own part, I can imagine several technological procedures to enhance human intelligence that seem plausibly within the reach of applied cognitive science in my lifetime.