Ha that video is not a fast update rate. It's just only updating a small bit of the screen at a time so you can't really see the slowness. Modern kindles are pretty fast but not video speed, and they still have to blank the screen after a few updates.
Yes, obviously I'm not going to be linking to a video showing a technology that doesn't exist yet.
The video serves to demonstrate that given some technological development the entire screen could be like that, and aside from that there are E-Ink screens in common use that can't refresh even such a small area that fast.
It's unfortunate that so much of this specific content is locked up as video. The part is $35 shipped on AliExpress, a great way to begin experimenting.
