Very clever! As a 10fastfingers fan it's interesting how this forces you to slowly dole out your thoughts instead of just dumping them at maximum speed.
It really makes it quite evident how variable the timings for certain letters and words are (like "the" is almost a single character).
Typing on a older Teletype machine is like that. The keyboard is mechanical - really mechanical, not just clicky. When you press a key, it locks down, and all other keys are locked until the previous keypress has been processed, which takes about 200ms. So you learn to type at a constant speed.
https://oztypewriter.blogspot.com/2014/03/evolution-of-world...
edit: I was great at jamming manual typewriters when I was a kid, because when I was unsure of the next character, I wouldn't release the previous key fast enough; I would rest on it for a fraction of a second. Bad habits.