[eevilspock]

You're missing his point, and what he is providing a counter-argument to. When he says "the Internet is in fact set up and operates in such a way" he is referring to the widespread impact of echo chambers and filter bubbles, the very phenomenon that most people consider to work against knowledge sharing.

"Counterintuitively, he finds that breaking down group boundaries to increase the spread of knowledge across populations may ultimately result in less-effective knowledge sharing. Instead, his research shows that best practices and complex ideas are more readily integrated across populations if some degree of group boundaries is preserved. "