“Spins” are editions of Manjaro maintained by Community members – the Official Manjaro editions do not support XLibre-anything.
Manjaro XFCE does still support X11, but for how long is anyone’s guess. Suffice to say, it might be for a while yet.
For anything to do with @DeLinuxCo and XLibre, I’d suggest you speak with John directly, or check his site for further information.
Regards.