[btam]

What you're missing is that PG says "can." When you're in a ten-minute interview that could change your life forever, you're going to be concise when possible.

That being said, I don't believe that one's 'natural' verbosity has any correlation with intelligence. Minds aren't that simple.

[Jebdm]

Sure; in the particular context of a ten minute interview, you'll have prepared and it ought to be relatively easy to be concise most of the time. But if they throw you a curveball, then I don't think it ought to reflect negatively on you if you're a bit verbose (though it might reflect negatively on you that you didn't anticipate whatever the question was).

I replied because the quote was taken out of context, and I don't think that the idea applies in the general case.