The referenced GitHub repo has a link to a google drive folder, with a bunch of pre-built images.
From that folder, I picked Raspberry_Pi_Devuan_beowulf_arm64_ext4_root_password_is_root.img.xz (built on the 16th of October), and booted in on a rPi 4b board.

It does boot, but wired networking doesn't work. As far as I can tell, no eth0 device is being created.

Is that a known issue? Thanks.