A higher graduation rate could easily indicate an easier curriculum or less qualitiy control. A better barometer would be how many of them pass the bar. I know about ten years ago or so that the percentage of SU students that actually pass the bar was pretty atrocious.
LSU-A is traditionally a two-year junior college. They have added a limited number of four year degrees and built a dormitory in recent years and even have a women's varsity basketball team. But it is still mostly a commuter school and most of its student body goes for two years and then moves on to a four year school. I imagine that is what knocks their numbers down. it will be several decades before we can compare it to a four-year liberal arts college like McNeese or Nichols,