"As I was doing it I tried to imagine what a transcript of the other guy's talk would be like, and it was only then I realized he hadn't said very much."
"Being a really good speaker is not merely orthogonal to having good ideas, but in many ways pushes you in the opposite direction."
"But here again there's a tradeoff between smoothness and ideas. All the time you spend practicing a talk, you could instead spend making it better."
I know quite a few people who are great thinkers and great speakers and maybe that is why I found the article a bit offensive in that regard.