Thanks for the software and documentation you've written for the reMarkable. I've taken a different approach for running Debian buster, but your guide [1] saved me a lot of time nonetheless.
[1] http://www.davisr.me/projects/parabola-rm/
chroot for now, systemd-nspawn as soon as I have time to hack on it later, as I want to be able to switch between whatever I'm running and reMarkable's original software.