I think the article severely downplays the importance of attractiveness. If the other party finds you attractive, the bar is lowered to the point of you simply being normal/average in terms of intelligence, wit, and whatever else you want to include in your definition of what makes a person "interesting". You basically need to be a vapid idiot to give anyone a bad impression as an attractive person. It's a huge facto…
It is usually much more important to carry yourself as attractive than to be beautiful. Confidence, honesty, friendliness, integrity, etc all can be assumed by a picture of a beautiful person, but in practice it's body language that portrays these qualities better. In addition, things like humor and other tips in the article can control someone's impression much more than looks.
Make yourself hot if you want. But if you're still insecure or unhappy inside, it's going to come off as unattractive. (Unless you then act more alpha as a defense mechanism to this... Behavior is complicated)