i think that what the original poster was getting at, is that, if you have any object and move it around fast enough, it creates effectively a sphere or other shape (depending on the angles of rotation) that one could hypothetically walk on as if it were a real sphere
so, according to his model, if we stopped the earth from its super fast spinning, we'd realize it's really a cube in shape
unfortunately, he didnt provide any evidence as to why this might bet he case, and there is plenty of evidence that earth is actually spherical (how would you DIG deep into the earth if it were a rotating cube?)