A high degree of impulse control is not linked to success? I thought that was one of the oldest and most well proved success requirements, also sometimes called

A high degree of impulse control is not linked to success? I thought that was one of the oldest and most well proved success requirements, also sometimes called "delaying reward". Also if you say "my group succeeded because we believe in our group" then you need to not analyse one generation but several generations together, because that statement is not about a single generation. E.g. the question is not why is the Jew John Doe successful, but why are Jews on average more successful now despite having faced a lot of trouble in the past? While this article seems logical in itself, to me it actually gave the idea that the book may very well have a point, exactly because of common sense.