The first list includes books that professionals read 2+years into their careers, the latter is a list of books that higher-level students read while doing an undergrad or masters degree.
I'm guessing people lie about the latter because:
a) they're much drier, and take more discipline to read
b) they indicate a more rigorous training.
I'm about a year into professional programming with no education, and decided a couple of months back to buy Intro to Algorithms. I've worked through about 3/4 of the chapter, including the exercises (with no answers :-\). It is actually not very dry at all, considering the material!
I'm guessing people lie about the latter because: