China is notionally both and what they're doing in Xinjang is at least genocide adjacent. Russia justifies their war on Ukraine as a struggle against genocidal fascists and again, it really seems like they want to destroy Ukraine as a separate culture and people by assimilation and extermination.
Both countries are frequently defended by left wingers
Of course there are idiots who defend China or Russia and call themself left. That doesn't mean that China or Russia are left. China has a weird form of state-capitalism and Russia is a facist oligarchy. They are not left, they are right extremists.
China is ruled by a communist party and position themselves as allies to left-wing governments around the world. They are clearly and explicitly left-wing.
Russia isn't left-wing, but they use they are acting like fascist and committing genocide-adjacent acts in the name of anti-genocidal anti-fascism, the rhetoric that the original commenter parodied
You do the same failure as many other people. To call yourself left or right doesn't make you left or right. Even the german nazi party NSDAP called thereselfs nationalSOZIALISTISCHE ARBEITERpartei Deutschlands and there some idiots who believe nazis are left. Of course there are not.
China isn't a left country cause they doesn't act like a left country. They have a system called state capitalism, they discriminate minorities and they cause inequality. All this is the opposite of left (the only clearly defined factor of left is the believe that every person is borned equal).
And russia claims that they fight against facists and is nevertheless facist itself, while their enemys are not. People, partys and even states can lie. Thats an improtant lesson.
the only clearly defined factor of left is the believe that every person is borned equal
This is a very controversial statement. The left is usually understood as referring to Socialism, and Individual rights are generally considered a liberal value.
The founding idea of Socialism is common, rather than private ownership. China has a very high degree of public ownership of companies, exercises a lot of control over private enterprises, and has limited private land rights. This is consistent with a Socialist approach. Restricting private ownership of land in particular is as of my knowledge unheard of under right wing governance.
China is very authoritarian and in many ways a poor model for Socialism, but it's way too convenient to simply write them off as secretly-right-wing revisionists