No, many have been complaining about the problems with AP, so I don't think his car all of a sudden failed as soon as it got new software.
My experience is that, while on a clean stretch of highway, AP is much more solid. It just drives and does what it should. 7.1 did a great job under these conditions but always seemed to be making micro-corrections to remain centered. Now it appears to be predicting its path further down the road and it feels more solid.
However, when road conditions are less than ideal I have noticed more problems than with 7.1. In one case, this morning, a lane split, it chose the left side but didn't quite make it and I had to take over. 7.1 handles this location for me no problem. I have also had it not manage to make curves (yes, on divided highways) that it used to handle just fine. It almost seems to behave like 7.0 did when it first came out. Perhaps a lot of the map data collected since 7.0, which improved over time, has been thrown out and they are collecting anew.