Comment by corimaith

Postmodernism itself by its nature is slippery to define, but it's functional result is endless, ontological deconstruction which is corrosive to any ideology reliant on grand narratives, just as to liberalism, authoritarianism and "historical continuity" is no exception. To properly "defend" yourself against it requires certain ontological structures that are fundamentally at odds with the authoritarian worldview, partly because authoritarianism is quite postmodern. They use it to attack liberalism, but at semantic level they aren't any better protected.

Furthermore on the more real side of thing, the postmodern condition is precisely what many authoritarians, namely China are wary of, yet it's probably true that the postmodern condition has already entered Chinese society with degrading social trust, increasing atomization, excessive materialism, influencers running amok, "bread and circuses" with gacha addiction - everything they critique of liberalism at a social level has come to them regardless.