Boomtown is indeed, full of crap.
They posted this news update leading many people to believe that Half-Life 2 has been postponed due to the September release of Counter-Strike: Condition Zero. Gabe Newell, one of the PR guys at Valve Software, has openly denied these claims. This is proof that these people post news updates without thinking, or without any research.
They did update the post, clarifying it's validity.
If anyone here checks that site regularly, I'd advise not to blindly accept anything they say as true.
EDIT: As a side note, Gabe Newell posted this below the article:
I've received a couple of emails about this.
No, CZ isn't postponed. Even if CZ were postponed, it wouldn't have any impact on the HL-2 schedule.
God I hate rumors.