I don't see how this is an accidental leak in any way whatsoever. They asked a multiple choice question. Often in multiple choice questions, made up or random stuff will be included as one of the choices. Like if there was a picture of a gorilla and asked what animal is this, a). chimpanzee b). Gorilla c). Bigfoot. That doesn't imply that bigfoot actually exists, or that the person who wrote the question actually photographed a bigfoot and is going to be releasing the photo publicly at a later date.

I mean the game likely exists. This however, is just a made up obviously wrong choice on a multiple choice question. Even if the game exists this has nothing to do with that, why would they have leaked a real unannounced game like that. They could have put Slalom 2, but that wouldn't mean Slalom 2 is in the works. Just a made up answer.