No, he's not acting. He's an actual fucking Nazi.

I'm fairly convinced that his father was Gunter Schwab, a NSDAP Environmental department head for the region around Ravensberg, Germany; of which Klaus was born in. He would go on to be a founding member of multiple other Socialist organizations, and even the German Green Party.

Klaus is merely re-iterating all the lessons that Gunter would have taught him. He wants purity of soil, which will require a large purification of blood. He espouses a Malthusian death cult narrative because he is seeking to reduce the population. The survivors not within the top of the higherarchy will be a slave class. However, if robots and automation through AI can exist, the slave class can be robotic instead, and there need not be any survivors.