Probably easier than thawing the gasoline in the ice engine, which freezes at -40. And your diesel generator won't run either unless you kept it plugged in to keep the fuel from turning to gel (that process starts at -10).
To be fair the comic said nothing of batteries. Case in point: there are "gas engines" that are basically a generator connected to an electric motor because it's more efficient than just using an ICE. The generator is optimized for small constant torque and the electric motor delivers as much torque as the system demands.