Even if Patrick is or has been a CEO of some sort (I don't know anything about him past what I've read today, but another commenter mentioned that he's working at Stripe), the fact that most of the article talks about how to make yourself more marketable to employers (by building up a capital of sorts, as he calls it) indicates that he has spent a good portion of his life selling his labor for wages. Something that people who own real capital (i.e. lots of money, infrastructure, the means of production, etc), i.e. capitalists, generally don't bother doing.