For Demos, it depends. The item itself doesn't have a type, the category they sit in does have a type. That is one reason why we did the category re-organization, to fix major instances where items were being counted as the wrong type. That would happen when there was a single category that would have games, consoles and accessories in them.
So if a Demo is in a Demo category, it counts as a demo. For Demos that are in a Game-type category (because that platform doesn't have a Demo category) then it counts as games.