No, that's not common. I guess that their humor is beyond edgy for most people. A related page is cat-v.org, which contains similar edgy jokes (see "Herrensystem 9" http://glenda.cat-v.org/gallery/)
Dropping casual fash references means you probably are fash. We've moved on from not taking edgelord Nazi references seriously since the late 2000s.
I knew suckless were assholes whose software philosophy was unworkable in the real world, but their casual nazism just makes me want to avoid them more.