you might be on to something here.
the only issue i have with this explanation is that the world is, in fact, telling them that the earth is round. every reputable scientist agrees, and they all have agreed for hundreds of years. to decide that all these people don't "have the correct answer", one would expect you to have some actual basis for it.
if you're going to disregard the entire scientific community of the fucking planet, you better have used a boat to sail all the way to the edge of the world. being convinced by a youtube video is ridiculous, no matter how we look at it. you don't need to understand the physics to know that the opinion of literally every great mind on the planet heavily outweighs that of a random guy who uploaded something to youtube. there is no rational way to come to that conclusion, at all.
people who believe this shit are a disgrace to humanity.