Two things refute that theory ... game time temperature at kick-off was 51 degrees, second, the Colts balls were also checked by the officials and all were properly inflated.
2PSI is one report...albeit not completely clear on -2 PSI from what. If altered on the fly, it is exceedingly unlikely to be precise. There was another report that that was wrong, and it was 1 PSI...which is entirely within range of the temp change (about 1.2, assuming 71F starting point to 51F. More if they’d just filled the balls and not let them reach equilibrium)
As for the Colts balls meeting specs, reporters have been having a lot of trouble pinning down when they were checked, and whether they were rechecked...forget finding out whether they began at the high end or not. So far...lots of tenuous assumptions extrapolated into silliness.
Here’s Theisman on the effects of the assumed difference: http://www.usatoday.com/story/sports/nfl/2015/01/21/joe-theismann-steve-young-nfl-deflategate-patriots/22130249/
There are other articles with other QBs stating basically the same thing.