There's an entirely logical reason why authoritarians undermine truth and truth-generating social systems.
The #1 goal of an authoritarian leader is to acquire maximum concentrated power relative to other people. Everything else is secondary.
One of the main ways someone's power can be undermined is by many people combining their small individual powers into a single coherent group. But that requires coordination and agreement. Everyone has to row the boat in the same direction for it to work.
Reality has a natural coordinating effect since we all share the same material universe. Thus, the more people are grounded in reality, the easier it is for them to agree and coordinate. They have a larger set of facts which they already naturally agree on.
Therefore, to undermine that coordination, every authoritarian regime in history has sought to undermine institutions and people that aim to discover and disseminate facts about reality.
Being an edgelord who repeats known falsehoods plays into that. It's effectively throwing up flak into the information sphere to obscure facts that might otherwise disseminate.