Don't miss the fact that the second personal foul made the FG easier but the first put them in FG range anyways. Additionally, they still had 22 seconds and it was 1st down so the Steelers could have gotten closer without the penalty. The second penalty did not, in itself, change the outcome. Besides, last I checked, the Steelers drove from their own 9 to the Bengals 47 without any help from penalties, including converting a 4th and 3.