It's the dunk tank.
This is where you come to post big-brained hot takes by chuds, libs, or even fellow leftists, and tear them to itty-bitty pieces with precision dunkstrikes.
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"Muh Soviet in a supermarket" story in 2023? My comment was also about McDonald's in the USSR, so they're feeling super exceptionalist over fast food slop.
Link You can't see this through Hexbear because they were banned for racism, war crime apologism and ableism 
I bet you're right about Ukraine, since now they have to whitewash the Holocaust more and more, they must accuse people of doing a revisionism if they get called out on it or even to just keep their facade of righteousness going (No, it's the tankies who are wrong)
It might be that or there might be a specific incident that brought the word into mainstream use. Did Putin use it in any of his speeches about the war that the libs did huge campaigns about because they didn't want anyone to learn too much about the conflict and didn't like that he was giving a thorough background of events leading up to it?
Putin talked about revisionism recently in the speech he made below the Stalin bust
Putin's use of it then? Was there one earlier in 2021 when this started trending upwards?
No idea, just mentioned the one thing I knew about. There is a good chance he has been complaining more about historical revisionism because of the Banderite cult doing exactly that, which is the first place I would look if you can't just look up "putin" "revisionism" viably.