This video is actually pretty great, and zeros in on an aspect of the modern flat earth “movement” that I think lots of folks miss. It boils down to a sort of scientific solipsism, wherein the adherents distrust anything and everything they cannot explain or experience with their own senses.
Modern science stands on the shoulders of giants. Probably no one understands it ALL, but we trust the scientific method, peer review, etc., to lead us towards the light. Flat Earthers see the implications of modern science, find it at odds with their lived experience, and choose their own naive POV over that of the scientific community.
In the 1800s, there was a similar problem; a man named Samuel Rowbotham pushed a school of thought he deemed “zetetic inquiry.”
In the Flat Earth sense, the term refers to flipping the scientific method on its head and deriving one’s observations from testing, with no regards to any hypothesis. Of course, if you did scientific inquiry this way, you’d end up with stating that a sphere is flat just because it looks flat to a relatively minuscule observer on its surface.