I've been struggling to put that particular feature of fascists into words. While they may believe in a factual reality, they simultaneously believe in a reality of ideals that is purer and superior to base level reality. It's why they can make up things about genetics or anthropology to justify their nonsense racism, because the scientific understanding is secondary. The fascist conviction is more important and truer. It's one of the reasons liberals have a difficult time talking to fascists (No one should converse with a fascist btw). Because liberals believe politics is downstream from information, which is downstream from unfiltered information. Liberals believe that if fascists are simply shown to be factually incorrect, the entire ideology will crumble.

Except fascists don't care about being factually correct, because to them facts come from a higher mindscape form of reality that fuels convictions down here in the dirty, less true world made of atoms and electricity. Some fascists are more self-aware than others I guess, for instance I think media people like Ben Shapiro are fully aware that this is what they peddle. They only seek to mystify and present the case for their ideal fabricated reality, while simultaneously knowing that it's false and doesn't conform to reality itself. But that part doesn't matter because for fascists who gain some degree of authority, the presentation of the fabricated reality is directly tied to the power and money they have.