The point of the stat is "costly" INTs that dropped a team's win probability by more than 20%. This has nothing to do with Brady vs Romo. This has to do with the stat. Typically, when you're losing (especially yesterday's conditions for Brady... 1 min left, down by 5, 85 yards to go) you have a very low probability of winning. Throwing an INT might drop a 3% win probability to 0% but it isn't that "costly" according to the stat. In Romo's case, on the first INT, Dallas had a 95% chance of winning and Romo's INT dropped it down to 70%. The defense's failure to stop them on the next drive dropped it very low, but then Romo's final INT dropped it another 20% down to 0%.