linux56 doesn’t have the zfs module, obviously. Architect would need another rebuild with a newer kernel, then the zfs module would be available during install.
The team is working on something else right now. Once that is done, probably @Chrysostomus will have another look at Architect.
With ZFS for the root partition always make a backup of the system, because you won’t be able to chroot into it from a live USB to repair it in case of a breakage. The only repair possible is to restore a backup. But making backups is easy which makes it less of a problem. That’s what I understand about ZFS for root on Linux.
Edit: I was a bit wrong, see below, you need an ISO with kernel headers and/or zfs extra module to be able to chroot. I case Manjaro doesn’t support it, create your own iso.