One of the points Jason wants to preach as part of the "lesson" of the book.
Is it true? Yeah, in part. Repetition is required for skill.
Also read it in the context of a city that is unabashedly defined by meritocracy. Billionaires have what they have because they earned it!
Maybe the truth is that it is both - that success at something both requires hard work and dull repetition put in by the individual AND the magic of circumstances beyond that person's control.
Definitely not a point made by this book, at least not at this point.