As a Microsoft fanboy, I'm sad to find out that one of Microsoft's most recognizable games was not even created by them in the first place.
It was a joke.
As for this being picked up by IGN... eh, not surprising. I still remember when someone claimed to have found evidence of a Daisy version of Costume Mario on the Japanese Mario Maker site, and with as much proof as this topic, it ended up on every gaming site going.