Here is the money quote:
We are actually more aggressive on the PC side where digital is very, very strong. We tend to be more conservative on the digital side for more console and more flexible on PC.
So, for PC games where there is a strong market (eg. more competition) they have to lower prices more aggressively. On the console market where digital distribution is locked to the store of the console maker (eg. no competition) they have no basis for reducing price, because your only option is to buy a physical copy.