The extension of 'the map is not the terrain' is 'the simulation is not the universe'. I'm not sure if that's an exact example of what you're saying, but, for

The extension of 'the map is not the terrain' is 'the simulation is not the universe'. I'm not sure if that's an exact example of what you're saying, but, for me, if any conclusion is that we're living in a simulation, then it's simulations all the way down. Or, we're living in a simulation because we understand and process the universe and our experiences through the filter of our brains, and our brains are, to some degree, an abstraction engine. Our physical bodies exist in the terrain, but the entirety of our conscious lives is lived through the map.