l am a little disappointed as it didn’t dive into how to make it work nonetheless.

E.g. I am guessing the power needed to use my old mechanical typewriter at 120 key presses per minute (so 2 per second) based on needed force and travelled key distance to be in the 0.1W range.
Not a lot, but probably enough to power an efficient microcontroller with a small LCD display.

I am convinced that with the right setup this could be actually working!

The world didn’t even end in this one. I think we need an infinite number of monkeys with an infinite number of typewriters, …

Original static webpage version: https://what-if.xkcd.com/102/