[pengaru]

> So how would a frozen car become warmer with a blanket, unless some subsystem within it is emitting energy?

Probably a reference to the well established practice of using block heaters[0] on diesel engines in cold climates... which AIUI are effectively just electric blankets. It's why you'll often see what appears to be a short extension cord dangling out the front of a big old truck where it snows a lot.

Obviously on an EV you already have much of the parts necessary to generate the heat, esp. if plugged in to charge... so it could just need the blanket/insulation part.

[0] https://en.wikipedia.org/wiki/Block_heater