These quotes all seem to go back to the webmaster of the site, not the acvtual devs of the mod.
The black mesa devs have a forum of their own. They have responded to this news in exactly the same way they have responded to all previous false rumours of black mesa's impending release: complete silence.
It looks to me like the usual false rumours that spring up from time time.
Also, the article above said that BM has had one projected release date (2009). That's in correct. The devs also promised (repeatedly, when questioned) in November 2010, that it would
definitely before the end of that year. You've got to wonder if they know what they are doing, if they could be certain of its near imminent release, and yet, faild to meet it and still over a year later, haven't managed it. What could cause that?
Edit: also, this a response from the Black Mesa project leader to a question about this rumour:
Rumour officially scuppered.