No, we should not be creating usable UIs instead of gorgeous UIs. We should be creating gorgeous and beautiful UIs. They aren't mutually exclusive.

This article is about creating things that look good. It isn't saying "this is all you should care about, it doesn't matter how your UI functions", it's just saying "these are some tips for making this look good". Making things usable is outside the scope of the article, but there's plenty of articles discussing usability. This single article does not contain every piece of information you need to understand interface design, it just covers one aspect. It isn't uncommon for an article to have a subject.