I don't see the point in that article. As far as I can tell this is just another person trying really hard to come up with a way to justify critiquing Musk.

Peter Thiel would classify Elon as a Definite Optimist in that he picks a better future and then builds it. However, most of our leadership and talking heads these days are Indefinite in that they can't being themselves to believe in any particular vision of the future.

This guy is just trying to pretend that Elon's confidence is somehow unjustified. How can confidence in a certain future not be overconfidence, right? It doesn't matter that Elon is clearly right, certainty in vision is always "overconfidence" to the Indefinite.