No, but philosophy and English (and French) literature majors have traditionally been on average quite smart. I really don’t know about library science, so I’ll believe their data. As someone else pointed out, none of these averages are especially high.
My point re: the physics anecdote was that engineering majors, while smart enough to do the work aren’t necessarily all that smart. And again, these are the majors to which high school students aspire—lots of those hoping to become engineers won’t make it.
Engineers certainly are a long way from stupid, but being notably bright isn’t necessarily the case, either. Dogged determination, more discipline than the norm, a degree of monomaniacal focus and better than average memory and spatio-visualization skills serve them better than raw IQ. Those end up being the physics majors.