It means the team hadn't quit on each other, as we may have thought after the USC game. That's a pretty big deal. If they had been blown out, it would have set the tone for another 8-5 win season in 2015.
And yes, LSU was 8-4, but two of those losses were to top-10 teams on the final play.
It was easily the best finish to a season in the last 20 years.