They have a video where they have an eInk display show video at 60 Hz. In contrast to a previous video, where the display was running at 2.4 Hz and the video th

They have a video where they have an eInk display show video at 60 Hz. In contrast to a previous video, where the display was running at 2.4 Hz and the video then sped up by 10x, this is not sped up. What kind of black magic is this? https://www.youtube.com/watch?v=XduK7wn9SE4 https://www.youtube.com/watch?v=XduK7wn9SE4