That is a very long article to describe the obvious difference between writing and text-based chatting. This is nothing new, it's been that way since the days

That is a very long article to describe the obvious difference between writing and text-based chatting. This is nothing new, it's been that way since the days of IRC, and probably other channels before that. If the author were to discuss this subject with another human being in casual conversation he wouldn't do it in the exact form of this article. There's no fundamental change happening here, just using language in a different way in different context.