I noticed that as well.
Check out the SEC network's replay of the game and you can see that at the 16:38 mark of the telecast AU gets the 1st and goal after the Woodall penalty. 1st and goal from the 8.
1st and goal 8 yd line--Tate for 6 yards.
1st and goal 2yd line--direct snap to Tate for 1.
2nd and goal 1 yd line--pitch to Tate no gain.
3rd and goal 1 yd line--pass to Smith TD.
Auburn scored on 4th down. They got an extra down.