According to the article, the "aristocracy" preserves itself by educating it's children well and teaching them to succeed on their own merits. Even then, those children must work extremely hard in order to maintain their position. And there are no real barriers to entry; in principle, anyone can do this, it's just that the wealthy are the ones who actually wind up doing this (probably because they are the ones who recognize the value of it).
In short, the 1% are the 1% because they are better than the rest, and through hard work and good parenting the same is true of their children.
Yet somehow, the article makes these exact same claims in a manner that will probably avoid anger by left wing sorts. I'm impressed.