I can't make sense of how this would have any effect on the A/C. The faster the fan runs, the cooler the A/C will be.

I even use my "instant cool button" when stopped in traffic to keep the A/C cool. (I put a button on the console to put the FCM into emergency mode, I don't use it much since I had the -10C mod done, which makes the fan run starting at 16 degrees lower than factory. But when I'm in stopped traffic on a hot day, I still use it to keep the A/C cold.)