Harry is just a freak of nature... There is no way any 11 year old has read and understood the entire corpus of quantum mechanics, cognitive science, science fiction, and rationalism writings, no matter how much of a bibliophile they are.

Agreed. It works in the story because you don't think about it normally, and can mentally substitute him for an adult and forget he's nominally supposed to be 11. But it's really jarring when attention is called to it as in this chapter.

Admittedly this is an issue with a lot of child based literature, but I suppose its especially noticeable in HPMOR because attention is being explicitly directed at the internal mental processes of the characters.