It literally says memorizing data isn't what makes someone intelligent. Second guessing yourself because of factual feedback you've received and not being falsely confident in everything you think is what makes someone intelligent.
Haven't read the stat in a while but it's something like an average increase of 5 IQ points for every year of school you attend. That increase isn't necessarily because of the data you've retained, it's from being tested on it and adjusting how you approach new concepts based on that feedback.
Very possible. I just couldn't see myself purposely saying something I didn't think was true and then doubling up with calling the other person dumb over it. I don't agree with almost anything she does though so that checks out.