Both things can be true at once: the politicians talking can have legitimates arguments while being part of pro-Russian parties that don't have power in Germany and do not represent the German government opinion.
It's not the argument made in the top level post, they are just saying “What I'm trying to say is that these two do not represent the German political landscape at all. […] This is not a debate happening in Germany right now and no other party has expressed support of any position.”
Maybe there should be a real debate on that topic, or maybe Germany should even pursue such a repatriation of their gold reserves, but as a matter of fact there's no such debate or plan besides fringes parties, that's it.