Here's the relevant bit in case anyone's curious:
It probably is, as it is also known as "The Shattered Sphere". Astromundi had some issues that wouldn't fly with modern WotC (the Antilan fascist/supremacists of the Sun Mage Empire, the Thoric "aryans" and the occidental thieving Varan being obvious examples). That's probably the reason for not using it directly.
Yeah this definitely sounds like a rebooted version of Clusterspace with the background details moved into the mythic past (so long ago not even the gods remember). It never made sense to me that the civilizations of cluster space grew out of the remnants of what came before when it literally involved two planets colliding. It would take millions of years for any of the resulting astreroids to become inhabitable again after that even with magic.
