Thats incorrect, the condenser temperature(within operating limits) has no effect on evaporation temperature.
You must remember that refrigeration is based on the liquid/evaporation cycle, whos properties are defined by the boiling point of the refrigerant, and the pressure differential at the point of evaporation.
The higher the differential, the greater the evaporation temperature will decrease. (get cold).
if you chill the condenser below the normal operating temperature you decrease the pressure needed for condensation, which decreases the mass flow of refrigerant thru the metering device.
Which yields less capacity, which in turn yields less cooling.
Again , I hope I explained that in an understandable way.
