If the error message is different, there's no reason to believe the issue is the same.
mount-fstab is a part of suite66-scripts, and here's what the current version does (https://gitea.artixlinux.org/artix/66-scripts/src/branch/master/module/boot@/service/mount/mount-fstab):
[main]
@type = oneshot
@version = @vers@
@description = "Mount partition from /etc/fstab file"
@user = ( root )
@depends =( system-fsck )
@options = ( !log )
[start]
@execute =
(
if { 66-yeller -cdp mount-fstab -1 /dev/console starts... }
if -nt {
mount -a -O noauto,no_netdev
}
66-yeller -Fcdp mount-fstab -1 /dev/console failed!
)
Essentially,
mount -a -O noauto,no_netdev
which just mounts all the file systems from /etc/fstab, except those that have the auto or _netdev option.
I'd try to enter that command from a live ISO chroot and see if it errors out.