I hope people do not use this to document their code for others. I code for a living and I cannot see screens or watch videos. Maybe to keep a diary, sure, but nothing can beat written text in terms of accessibility.
It's way easier just to write a decent README.md.
Wonderful documentation is hard to beat from my learning perspective, but I find that level of quality is more rare.
Therefore, I learn better by watching something materialize on video at ~3x speed and often without any speaking.
I think it simply boils down to my level of trust that this person didn’t accidentally omit anything from their article or blog post or whatever and what I see on the screen is what I get. Now, that doesn’t fix when tools change etc, but videos instill a higher level of trust that, if I follow these steps, I will produce this output.
I think that an audio (or video) version would be superior, but more because, assuming there are captions, the audio might be able to describe something beyond the code alone more easily than typing out a note would.
You don't just take a transcript of the dialogue in the movie to make a book.
tl;dr: Refactor not comment
You might need comments to describe why you are doing something. And you definitely need comments for why you are _not_ doing something else.