I thought he scored the whole movie..?
Edit: Yeah, the news post is poorly worded. He scored the whole film, and 5 of the 19 pieces from the soundtrack are available for free.
Yeah, you have to keep reading the whole site. You can download a free 5 track sampler of the full score which was done by Trent Reznor and Atticus Ross, which you will have to pay money for.