In one sense the author is right. In another sense, saying "I have no idea what I'm doing" is a status play. Those a bit down on the totem pole don't have the luxury of publicly questioning their own competence.
That's sometimes true, but it's nice to hear someone with status admit they're not an infallible paragon. There's value in that, especially for those lower on the pole who stew in their own minds with assumptions about how everyone else is x amount smarter and more competent, however true that may be.
Hmm. I don't agree. Is it better to publicly represent that you are the smartest guy in the room and make the people lower on the totem pole feel bad? Maybe it would be nice if the normal way of things changed so that you didn't have to pretend in this way (never admitting vulnerability) just because you felt your position was insecure.