To me, this sounds like legal ass-covering to be used as a defense should Microsoft ever be investigated for attempting a sort of gaming monopoly. "No, we're not buying out all the big developers so that we control the AAA playing field, we just don't like exclusivity!"
I mean, if they don't like exclusives, why go on to complain about how much they're losing by putting their games on the competing console? Sure sounds like they'd rather not pay those fees at all, maybe... by making their new games exclusives? Hmmm...