The point isn't that they're the only ones doing it right. In fact, he lists off other entrepreneurs that did the same thing. I think their point is made well, and they're just citing other examples of people doing it or that have done it historically.
What they're saying is build a business, not just a thing to flip. Focusing on the business will, even if you end up selling it to someone else, make it a better venture in the end, and more satisfying to you as a person.