I can understand the frustration with miscommunication, but no one is going to say "it was a shit tonne of money, period". Of course they're going to be vague, outside of financial issues it was never going to be an exclusive.
From MS side, it's all about changing the perception and showing that they can compete for content with Sony. So Spencer saying "it's a X month exclusive" would kill the perception he's trying to create (if it works in changing people's minds, that's a different story). From a business perspective it's perfectly logical, from a fanbase point of view not so much.