I think this really ignores the difficult problem of disseminating information which was much more challenging before the internet. We weren't limited by how fast we were printing books but how hard it was to find information already printed. A book on its own is useless if nobody knows about it.

The real idea here was that the internet would be a game changer. Not only would information be available immediately - but you could actually find it. When it became cheap to find "correct" information the idea was that would dominate. The implicit assumption was that people actually wanted correct, accurate and truthful information.

In practice it turns out people prefer information that validates their opinions, regardless of accuracy.