I hear two conflicting versions.
1. The game is pro communist and allows you play a fash bashing commie.
2. The game is anti communist, and while you can do a commie playthrough, it makes it clear it's a failed ideology.
Which one (if any) is true I don't know.
The writing is undoubtedly more sympathetic to commies than anyone else. Just off the top of my head there are two "working class Joe" characters; one is a union boy who wants to fight for workers' rights, and the other
also believes in the idea of workers' rights yet believes both unions and ethnic displacement are a problem. One is a power-to-the-people stereotype that communists often picture in their head, while the other is one red hat away from being a Horsey caricature. (He actually
kind of looks like a
Horsey character.) Some differences between the two:
1.
The commie actually has a name and plays a major role in the story. The other guy doesn't receive any humanizing qualities whatsoever (like a name.)
2. The commie's descriptors make it sound like the sort of guy the game's writer would power-bottom for. The other guy is fat, small, pathetic and
an incel.
3. The commie has a heroic stand-off with a literal super soldier and, even if he loses, it's obviously a heroic sacrifice. The other guy is framed by you for a crime, where it's portrayed as comical. The idea of a police officer framing a working man for a serious crime would normally horrify most leftists, but not when it happens to someone they disagree with.
4. The commie has the blessing of
the obligatory lawful-good negro who can do no wrong. The other guy is the only person in the entire game to piss off your sympathetic companion. This is accomplished through racist rhetoric, which is strange because
the giant neo-nazi says the same things to your partner yet he doesn't seem to care.
5. The commie is so powerful that if you stand up for yourself (i.e. be an actual cop)
you get killed without exception. The other guy requires a trivial skill check to defuse. (Not that he's given any real opportunity to express himself, as other characters get.)
Disco Elysium is competently written for the most part but it's no exception to the most common, most glaring problem with leftist writing: Under no circumstance are they able to write characters who
actually sit on the opposite side of any given political issue. Fascist extremists? Those can be characterized. The giant neo-nazi I mentioned is (perhaps not intentionally) written to be the only guy in this entire story who tells your character to go cold turkey on alcohol, exercise and read some books. An actual working-class man who doesn't agree that unions will magically solve all of his woes, and does not agree with the mass import of some other ethnicity (who will compete with him for work)? That guy isn't allowed a voice. Robert Kurvitz probably believes giving that character a voice would be empowering "a real threat" vs. the fascists, who are as politically-inert as communists.
Sorry for the essay, but it's pretty common to hear "Disco Elysium mocks both sides actually!" when there's undoubtedly an author bias. You don't even have to dig to find it.