If anyone wants to make a similar project, there is a great Rust API to most of the Waveshare displays[0] (I added support for the display mentioned in the article, 5in65f).

I also made a project[1] with it that generates art using a gameboy emulator and some static images and other transforms to show on the display.

[0] https://github.com/caemor/epd-waveshare

[1] https://github.com/crzysdrs/slate