[jordanb]

Pointing out somebody who was born into wealth who's good at a thing doesn't disprove his thesis.

I'd counter your example with another: the documentary Born Rich pretty well captures the article's point. There are lots of young people who were born into very wealthy families who clearly don't understand how anything works even at a basic level and at some points of the movie the more self-aware ones are anxious about and reflect on this fact.

For instance one admits that she doesn't understand how her credit card bill ends up with so much money on it every month, how people could possibly live on a fraction of what she spends, or how money is made or how expenses are paid. This fills with anxiety because she understands that she is utterly dependent on the largess of her family.