internet - LA Times censors its journalists

Next time the Los Angeles Times writes about censorship on the internet in China, they can ask for expert information of their suppliers, Boing Boing reports, based on information of LA Observed. Peacefire, a website fighting censorship software, has disclosed this. The Peacefire website is not available for LA Times journalists without explicite permission.
I just wonder why those journalists did not find it out themselves.