This is written so incoherently that no one should be taking writing advice from this person, whatever that advice is.
I do wonder if it's just a question of attention span. Does the author ramble or am I just incapable of following along on a long form article? Would I have read this article before the internet? I truly don't know, but I do know that there is literally a nearly infinite amount of material to read (relative to my time remaining in life to read it) and I can't waste time on writing such as this.
I think the problem is likely that neither this teacher nor any students really understand what "show, don't tell" means, and tend to overuse it when they think they do.
That's just a guess, though. This article is a pretentious mess.