You're correct that PS3 and Xbox are now selling about the same. PS3 has overcome a widely publicized botched launch and, while still the clear #3 (keeping pace when you are 6 million consoles behind does not help you catch up), is no longer the disaster it was 9-12 months ago. So the author's information is out of date as much as inaccurate, and the phrasing is poor.

Jumping from that to accusations of "MSFT is exerting pressure on the writer, everyone's out to get the PS3," especially when the review is positive, is archetypal fanboy behavior. The corporate relationship you cite is more out of date than the writer's sales data. And MGS4 is clearly the PS3's first system-selling exclusive, which was the author's larger point.

A non-fanboy response would've dismissed the silly conflict of interest idea and merely noted the author's information is out of date without assuming the author shares the malice of 17 year-olds flaming each other on message boards.