Since TC really isn't temperature control but ohm control it still sounds like TC to me. Even when it's in VW with none of the TC protections. It just takes a different route to set the ohm control than using a TCR to predict temperature.
In VW if you puff hard you're cooling the coils differently than if you don't puff at all.
So once you set replay in VW with no temperature protections it's still adjusting the temperature to different air temperatures and air flows because it's trying to match the ohms it had before. So you still have temperature protection just no idea of what those temperatures are. You may not have dry coil protections (although you may because that also works by reading ohms).