Some cars do have additional resistive heating or heat pumping through AC, where that is technically driven by engine power, but not from the waste heat.

In any case, the key point is that in an ICE car the heating is mostly "free" since the engine has perhaps 40% efficiency and the majority of heat released by combustion is unused/unusable waste heat that might as well be used to heat up the car if you need to, but in an EV you don't have that source of free waste heat to tap into, and you have to use the energy that you could have used for moving the car instead.