Agree, it's a fork, and was never merged back with the main branch as it was updated.
Area 52 has been on hold for years:
http://discuss.area51.stackexchange.com/questions/5089/next-...
Robert knows Area 51 isn't working, but given there's no other way to launch an SE users use it and SE as a result doesn't replace it because they're not interested in the long tail of active Q&A communities; last I checked, it takes them months, if not years to move a site from beta to live even after the community mets SE's requirements.
Basically, SE changed their past policies to avoid building Area 52 and SE has no idea what a working Area 52 would be.
If you want an SE, you've got to understand how Area 51 works, get all of your ducks in a row, then roll through it and the beta; otherwise your just asking for problems and leaving it up to SE to help, which is problematic.
To me, the more interesting question would be what are the numbers since launch for Area 51's launch funnel; that is from submitting a proposal, de-duplicating it, (etc), site leaves beta.