Very cool, but the fact that the keyboard on the screen doesn't match the output (input?) nor the asetniop 'idea' makes it incredibly confusing and was enough for me to say 'ok, I'm done'. Unless it's just a problem that I'm experiencing, it doesn't seem like the author (or anyone) ever tested this tutorial out.
The demo could be done better for sure. A few steps in I think I encountered a bug that was chording keys that I was only pressing one at a time (forcing a backspace when I wanted the literal 'st').
I was working on the versions for Colemak and Dvorak users at the same time and forgot to update the original; it's sorted now. Please give it another try!
Depends on whether your keyboard is mapped to the Dvorak layout or Qwerty (basically, try one, if it doesn't work the way it's supposed to, use the other one)
Press enter about 15 times to skip the first part of the tutorial. The labels in the later part are correct and also show the other secondary chorded keys.