In truth, and honestly I love this, the great race space subforum is dead because there are vanishingly few non-white people and actual true and honest women on Somethingawful. Its very much a site that reflects the fact that it hasn't truly changed its userbase in any significant manner from when it was in its heyday in the early 2000s, so accordingly its dominated by basic white shut in male nerds.
Its probably the most inactive forum on the whole fucking site, look at the front page for it right now, at the bottom of page 1 it has threads where the last post was more than 2 years ago, In contrast, the next most inactive part of the site is, to nobody's surprise, the subforum for goons to go outside and do something physically active in the great outdoors, the thread at the bottom of page 1 there had its last post in November 2021.
Funnily enough, TGRS was considerably more active for a while when one specific thread was moved to it, but that thread was later moved to BYOB. That thread, of course, was the troon issues thread.