Patreon doesn't like sexual portrayals of people that are in a certain relationship.
So a devs options are to either cut/censor the sex or cut the relationship.
This dev doesn't want to cut the latter, meaning the dialogue flavor, but chose instead to cut/censor certain scenes deemed inappropriate, for the "patreon version".
But there's another version,

allegedly. I dunno

That "Uncensored Patch" in the OP looks rather suspicious.
Is this a conspiracy against Patreon? I remains to be seen.
Edit:
If not, then the violence planned in this game has to be some hardcore shit to deserve an +18 rating.
More brutal than DOOM