I'm sorry you didn't find it useful. No need to dissuade others from reading it, especially beginners, because it will help them write better Django code.
Better? Half the article is opinion and taste, the other half is simply wrong, as others have described here in detail.
I found it useful. I've been using Django casually in hobby projects for a few years now and your article just taught me about the N+1 query problem, so thanks!