I didn't realise we were throwing logic and knowledge away and going into the realms of pure fantasy. My mistake for expecting a logical, scientific discussion in the science section.
You are missing the point ... IF there is such a station it would be in much use to DoD and similar agenices, they could make all sort of research and testing that they cant do on ISS, now you made a good point with China and Russia observing/detecting such a platform... but would a superpower go public by saying such a thing about other? Or would you rather be silent and still know what they are doing? In my opinion no one would ever go public with information of such magnitude except the makers/keepers of it.