Your right. in heat mode the condenser doesn't take/absorb heat from the outside air.
Since the condenser, is not outside.
In heat mode, the outside coil is now an evaporator coil. And the indoor coil is the condenser coil.
As the refrigerant boils inside the evap coil, it absorbs heat from the air moving through the coil.
Without the air moving through the coil. The coil would freeze up very quickly.
In heat mode, the indoor coil is the condenser coil, and the cool air of the house blowing across the coil cools the vapor so it can condense into a liquid.
Without air flow, the refrigerants pressure would increase to an unsafe level(if there were no safeties on or in the system).