"I would hope you put more effort into thinking of a melody and harmony than this, but the point is that rhythm makes a gigantic difference, even if everything else is messy."
I wouldn't have minded some examples, but it bothers me that the entire lesson about rhythm is based on mashing his hands on the keyboard. If you're going to learn about rhythm, it would be useful to know what rhythm is for beyond "it sounds better than no rhythm."
You should read the article before commenting.