I'm a little skeptical about that number of 8KwH. If 100% efficient, that would nominally let you run the car at 8KW for an hour. 8KW is 11HP. The car looks like a standard mid-range sedan to me, the kind that would have a 1.8-litre 140HP engine in Europe ...
The 8KW number is consistent. Like you say, 11HP for an hour, and they only claim 40 mile range in EV mode). A car that size, on average only uses about 11HP.
The flaw in your analysis is that a 140 HP conventional ICE car rarely ever produces 140 HP (only for an instant during hard acceleration at the peak of the torque/RPM curve, and then it's time to shift again). The torque/RPM curve of an electric motor means you don't need 140HP for acceleration, all those ponies in an ICE are to compensate for the lack of low end torque. An electric motor has max torque at stall (0 RPM).
For reference, the Tesla Roadster gets about 225 miles on 55KW. At 55mph, that's about 4 hours of driving, or 13.5 KW continuous, or about 18 HP (100% eff for simplicity) in a high end performance sports car.
I don't see many sales at this price.
People will buy them to make a statement. I also don't think those are the kind of numbers that work for GM. But it helps them in the 'PR' war - people keep saying, "Why can't GM make a hybrid or an EV, etc, etc." So fine, here you go, want one - $41,000. If you can find a cheaper one, buy it.
-ERD50