Funding gaming companies for ports, exclusive games and even just to prevent the game from being ported to another console was common in the previous generation and was widely rumored to have started with Sony on the Playstation. The fact is that exclusive third party games on a non-dominant platform are typically bought in some way; 'shared' marketing expenses, traded IP (Nintendo's favourite) and cash transfers are common ways to capture exclusive games.
The scale of this deal is what seems so off ...
Unless these deals are based off of multiple games and involve a large portion of joint marketing I can't see this as being true. If you assume that these numbers represent 2 games for each series and that 75% of the money is joint marketing it would become more plausable.
