From what I can gather, Brin and Page have never been polished image-centric executives like their peers who lead other public companies. There's a reason they don't come out much.

I mean, he was a software engineer to start off.

Facetiousness aside, the deposition went on for 5 hours. It's quite a stressful endeavor that makes it more difficult to control any linguistic idiosyncrasies one might have.