What kind of phenomenon are we dealing we here with, though? How does it compare to our varieties of: - birds aren't real - Flat Earth - Atlantis (did Plato

What kind of phenomenon are we dealing we here with, though? How does it compare to our varieties of: - birds aren't real - Flat Earth - Atlantis (did Plato made it up or not?) - years 800-1000 were completely made up so some guy could be crowned king in the year 1000 - DNA evidence shows ancient Egyptians are Eastern Europeans