to my understandung this strong "fascist" hypothesis is hypebole. he was member of a conservative student association, however those were prohibited by the Nazis.

correct is that he was a conservative engineer who happened to be intelligent and live in that era, and who was lucky enough to work in his domain instead of dying a cannon fodder somewhere. did they build weapons? sure thing. does that make him a convinced fascist? certainly not.

he wasn't even member of the NSDAP party.

here is a short biography based off complete archive material:

Deutsche Biographie - Zuse, Konrad https://www.deutsche-biographie.de/gnd118637436.html