Here is confirmation of what stats are being fixed/tuned:
http://www.operationsports.com/forum...ng-update.html
Other stats were RB TDs (which is apparently related to a goaline AI issue, so only a partial tweak for that), reducing overall passing TDs and increasing INTs, etc.
Most supersims I've seen turn into shootouts, skewing the stats and while I'm not sure, I think they suffer from the same issues as a simmed game.
A fully played game with the right quarters will generate more realisic stats overall, but certain AI decisions will still hamper some things (for example, RBs catching tons of passes regardless of the team and primary wideouts not being enough of a focus often times).