This is based on Germany's current energy mix, which produces a lot of CO2 because Germany still relies heavily on coal and gas.
Yes this is incredibly depressing. The gouvernement is rather supporting coal industry via subsidies so the party dont loose the vote of the workers instead of support new technologies. Why are we ruled by such people?
Because they also represent other people that have jobs. Neglecting those has already led to Trump and the international growth of right wing parties.
They didnt factor in the environmental impact of extracting, refining, transporting & storing fossil fuels like diesel. Which would represent the fossil fuel, hydrocarbon based equivalent to a tesla's batteries.