This sounds like the German version of the bendy bananas lie told to Brits about EU regulations, a lie enveloped around some small fact and overblown to look as ridiculous as possible.
Also, the Greens pushing for money to wean Germany off gas is probably quite good for national security, not directly military related but does help in 2nd order effects (less reliance on fossil fuels saves the German economy from being a hostage to cheap gas as well as helps keeping fuel for the military if the need arises).