Left leaning positions: "there should be no Billionaires", "companies are inherently evil", "there should be no borders", "the US is currently a fascist country". Just as bonkers, so now what? Or rather, I think it's just as easy to find incorrect left-leaning elements.
The majority of these are not what left-leaning people are saying, it is what right-leaning persons say left-leaning persons are saying.
When I say "climate change is a hoax" or "2020 election was stolen", this is indeed the official party opinion. If you ask Trump "do you believe that", he will say "yes".
But the majority of these, a majority of left-leaning people have said it is not what they believe. And a lot of them are way less "empirically incorrect" than you say. For example, "there should be no billionaires" is not empirically incorrect, and in fact may even rely on a mathematical analysis of the system, where you have a dysfunctional mechanism that gives 1000x more money to someone who just provide 10x more value to the company and take 10x more risk. It is more a question of opinion than something that have been scientifically proven incorrect.