I wandered across this today. I'm kinda bad at talking about these sorts of things so I'm just going to let the link speak for itself.
They have already said that listing Half-Life was an error on their part.
I just realized there's already a thread about this. Moving the link to that.
lol... I am clpsing this... I actually wrote an article about this earlier today but decided not to post it... my article was mainly a rant about how three times a month everone freaks out over a HL3 flase alarm.