Did he actually say he read textbooks? I was under the impression that he was referring to something that would be more suited to the average or even just unini

Did he actually say he read textbooks? I was under the impression that he was referring to something that would be more suited to the average or even just uninitiated reader. I know a bit about the concepts of quantum mechanics, just from reading various books of varying difficulties on the subject, but I wouldn't claim that it was equivalent to actually taking a course on them or going through a textbook, even when I did take notes. I realize it's right next to when he says "[I] can read my textbooks twice as long without mental fatigue", but that seems coincidental juxtaposition, rather than him referring to the same books. Please correct me if I'm wrong, but it doesn't really seem that implausible, if that's the case.