Just going on the timing of the Tweet, which was after the game. But true it could have been under dispute during the game as to whether it was Armstrong or Parsons or a half for each, or that it was a disputed rush. Nantz called it as a "stumble for a loss of a couple" so he clearly thought it was a run and didn't call sack. Nantz also soon after said the Cowboys had 4 sacks when Romo was asking how many did Parsons have and Nantz said only 1. From that point until the end of the game, no one said the Cowboys had 5 sacks. So perhaps it was changed after the game.