It's true. Look at 2014. They had a few low scoring games to help an otherwise
Poor D that had extremes on the other end. 33 to UVa. 35 to USU. 31 UCF. 42 to Nevada. 55 to Boise. 42 to Cal. 55 to Memphis. Even UNLV put up 23.
MTSU, Uconn, Texas, and an FCS helped the average but overall it was horrible with the extremes.