Nearly half a million years. I don't know much about chemistry or biology, but what I do know tells me that this can't be true. Did someone jump the gun and go to the press early, or could this be for real?
The inside of a tooth is a pretty good spot to stash away something you want to preserve - and Atapuerca has yielded a lot of fossils, which suggests that the site itself has above-average preservation. I'd like to see the published paper, though, to read about how well preserved the DNA they found really is.