Norway also exports and imports energy to Europe to exploit the potential for energy price arbitrage. In effect,
any country that is connected to an international energy grid has partial responsibility for bringing down global CO2 emissions.
I don't see how this is an argument against electrical vehicles. In fact electric vehicles should increase the incentive to reduce the carbon emissions of electricity production since now at least improvements there will have a material effect on the carbon efficiency of transportation.
(Norway built out most of its energy grid before the oil industry got started, by the way -- but we do maintain out grid partly using tax money from the oil sector, just like all parts of our public sector).