How would i perform an offline installation like shown here (https://wiki.archlinux.org/title/Offline_installation#File_Copy_Method)
Copying the root file system and the kernel works but is there anything i need/should disable?
It will probably work just fine. You can skip the systemd parts and remove instead a couple of artix-live components (artix-live-base and artix-live-$init). However, your install system should boot just fine even with artix-live enabled and you can remove it afterwards.
Standard disclaimer: haven't tested it myself, do it in a VM before production.