There's nothing in this blog post that's blatantly wrong. There's also nothing in it that's news. It's not written better than other sources that have made the same point, which sources include several famous blog posts from usability and UI experts. The author isn't a usability or UI expert. In fact, I'm not sure who he is.
At the very least, he's notable for taking all the competing arguments and putting them together into a single post that people have noticed, thereby becoming a potential reference point for future people who will make the exact same arguments.