Well it contains cardboard and wood, so it's made of cardboard and wood, among other non-flammables. If I say the house I live in is made of stone, brick, cement and rocks, obviously you know it has windows and insulation, and whatnot. It's still made of stone.

Yes of course you are right, we describe homes based on the component that makes up 1% of total volume. Get out of here with your silly statement. Drywall may have a layer of paper/cardboard but that does not make it a cardboard home. Modern exteriors often use cement board, with a plastic vapor barrier. We don't say the home is made out of plastic and wood. Saying so is just to create a reaction.