Another update to this in case anyone ever comes across this looking for answers for themselves, the code I posted above only works on BIOS computers and not EFI computers. Only EFI computer you did to run this code instead:
getpartition file /batocera-boot.conf root
linux /boot/linux label=BATOCERA console=tty3 quiet loglevel=0 vt.global_cursor_default=0
I hope that help anyone that comes across this.