Just about every martial art demo is a masterwork of deception. Fundemental dishonesty
This is true of real demos as well as fake. The art of war is likewise based upon deception. I think the no touch or light touch techniques of advanced systema practitioners are no different than similar techniques by advanced exponents of Daito-ryu or Aikido practitioners in this regard. They're using a form of deception to affect their uke's/attackers.
If you watch the attackers closely as Dan says (and you know what to look for) you can see if the uke's are dishonest - it's difficult however to assess the demonstrators skill based on observation alone.