Let's ignore the fact that they have had to update their projections at least twice due to some kind of issue (Yanks 3rd? Yeah, better re-do!) - but a projected 836 runs scored for the '10 Yanks?
The Yanks scored 915 runs last year and allowed 753. While Vazquez should help the runs allowed number I doubt it gets as low as the 707 they project.
A drop of 79 runs scored, though, would be a big number. Yes, we lost Damon and Matsui, but Granderson's production will cancel out Damon, and a whole year of Arod + Nick Johnson should make up for the loss of Matsui.