Hence the link to the Denso scroll compressor with gas injection that allows it to work down to a claimed 10°C below freezing, or approximately 15°F for the HVAC technicians in the audience.
I do not question your expertise in home or commercial HVAC and Heat Pump applications, but residential/commercial and automotive heat pump installations are not identical.
If you read the "advertising" from Hyundai, you would see that their heat pump is designed to pull heat from the air, from the battery, and/or from the motor and motor controller, whichever is optimal at any one point in time. On a zero degree F morning, resistance heating will be used to warm the battery. Once the vehicle is in motion, the motor controller and the motor will be providing heat that can be used by a heat pump for cabin heat, even if the outside air temperature is still far below the working limit of the heat pump.
If the temp is above the break-even point, like 20°F, then the heat pump can be used to preheat the battery pack more efficiently than resistance heating can.
I don't understand why you are being so obtuse about heat pumps in electric vehicles. They clearly and demonstrably are being use in EVs, so why are you continuing to try to prove that they're useless and impractical?
No electric vehicles that I am aware of use heat pumps to warm up battery packs in sub-freezing temperatures. None of the documentation that you have provided demonstrates that any models are currently using heat pumps to do this. Show us specs where a manufacturer is claiming to use a heat pump for this application in one of their vehicles. Can you even find us a Youtube video where an owner is claiming that a heat pump is being used to preheat the battery at a charging station in sub-freezing temperatures?
I am not the one who is being "obtuse" in this discussion. Many have tried to correct you, but you persist in arguing about something that you have provided ZERO documentation for.
And yes, I have serviced units in vehicles and homes and also including refrigerators and freezers. I have equipment, tools, knowledge and experience, something which you unfortunately do not seem to have. You simply do not seem to understand the limitations of heating and cooling equipment and their application in this case.