The snake arm is quite simple. The "snake" part is a set of dumb hinged segments; it's all cable-driven from the base. The application does not require much rigidity or repeatability. The load is low; it's just carrying a power cable. There's probably a camera at the end of the tentacle to guide the connector to the car's power socket. The car opens the connector cover, so there's no need for a mechanism on the robot to do that. This is much simpler and far less bulky than the automatic fueling systems that have been built to refuel cars.

The marketing value of this is enormous. People won't have to get out of their cars and get their hands dirty handling a gas hose. This is going to go over big with women.