But exactly that was my point - unless you know what either reality or a simulation really looks like, you can not look around and draw conclusions whether we l

But exactly that was my point - unless you know what either reality or a simulation really looks like, you can not look around and draw conclusions whether we live in reality or a simulation. People trying to do this make the assumptions that a simulation would have properties similar to simulations we perform and that reality would have properties similar to the laws of physics as we know them, but neither assumption seems really justified.