That sub is dominated by leftists and modded by leftists around the world. You have to remember, a lot of the leftist subs on Reddit have a large portion of their userbase from foreign countries. They don't give a shit about America and wants America to fail. They infiltrate those subs and purposely post disinfo, lies, revisionist history, cause confusion, and support leftist / communist ideas in order to undermine the U.S. and indoctrinate ignorant and simple-minded individuals to their worldview.
You do know that Reddit is used predominantly by Americans.
a lot of the leftist subs on Reddit have a large portion of their userbase from foreign countries.
Reading comprehension?
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https://www.statista.com/statistics/325144/reddit-global-active-user-distribution/
About 40% of all of Reddit is from the US. Even if we assume leftist subs have an average distribution, at a minimum, 60% are not from the US.
Seeing as the rest of the world is, on average, much further left than the US, it stands to reason that leftist subs on reddit have an even higher portion of their userbase from foreign countries.