In it he tests whether there is any statistical evidence to suggest that some QBs perform have an ability to perform better in the redzone than others (they're clutch). He finds that which QBs do well in the redzone and which do poorly has little to do with how they do on the rest of the field, strongly suggesting randomness. QBs that perform better than average in the redzone are very likely just lucky. And who was really lucky in the redzone this season, Mr. Touchdown, Tom Brady.
I've said it before and will say it again, "Brady is a great QB, one of the top 2 in the league, but his shiny new TD passing record is a product of a lot of attempts, a bit of luck and having the force that is a motivated Randy Moss."