This package ships a pre-built Android 10 GSI (Generic System Image) so that the Halium initramfs can pick it up during boot.
Shipping the system image as a package allows to bundle it directly during rootfs creation. This essentially removes the need to download a suitable system image manually.
Furthermore, updates can be then supplied via APT as standard Debian packages.
Yes, if you put your android-rootfs.img
image in /userdata as you
usually would with halium9, you're good to go.