Well, the examples were the content of the talk. He didn't need the examples at all, but they demonstrate a severity of the problem. And to that point the talk needed to be slow so that one can try and answer the question, if the answer was just given it is harder to see the difficulty presented.

I also must confess, I didn't watch the video. I was there, so there is a good chance the presentation doesn't translate well to video in terms of speed of content.