"I was talking about the reaction of airplanes with counter rotating propellers with a critical engine failure"
...and I was trying to help you. If you stated what you wanted to know I would have addressed it - maybe I see where Scroggs was coming from.
However. Because the Duchess has, as you state, counter-rotating props and neither engine is vital for hydraulics etc it does not have a critical engine. So you will practice engines failures on both sides. You'd think that less P-factor makes it easy but I assure you that you will still need a hefty boot to cope with assymetric flight (especially during Vmc demo when you will de facto have full rudder inputs) and the engine failure drills are the same; therefore, it does teach you how to safely operate a ME aircraft.