Sorry, but I think that's really bad advice.
For one thing, it doesn't give new users any positive experience or reason to learn vim. If all you learn is to do things that are "pointless" (like learning hjkl), then you won't get any value out of vim. And if your way of learning is to do something that screws up your file and try to recreate how that happened, well, let's just say that every time I do something that screws up my file I'm in the middle of working, and the last thing I want is to stop and fix some random problem.
I usually recommend people try to get into vim easily, then learn the GOOD things. I.e. I think it's perfectly fine that people start with arrow keys, much as I love hjkl. But to get value out of vim, you should really learn "f" and "t", and text objects, then how they compose with "c" and "d". That is the reason I started loving vim myself - that's when I saw that it gives me something that other editors didn't give me, adn that encouraged me to explore further.