OK so that took a bit of Googling. Apparently GnomeOS is Linux Distro with Gnome and its dependencies all installed and configured correctly and is intended to be used as a reference platform for developers who write Gnome apps.
Why is it so hard to actually put that on the website?
It's still very new and a very small team, i would suggest reaching out and maybe asking them to add that to the website, seems you summed it up perfectly!