I get the impression of the game reflecting them being fucked up edgelords along with the actual fash propaganda like the Happy Merchant, but that the sadistic porn elements don't serve an ideological purpose beyond perhaps getting the game banned so they can make controversy around it based on things like the flag (as they ended up actually doing). Maybe not, I don't know. If they had an ideological reason to want to promote sexual violence, etc, there are other ways of doing it (see any anime ero game's representation of consent) that I think would be more effective in bending some weeb's attitude and encouraging wild misogyny. I don't really know though, just my opinion.