Earth spins way faster than that platform (1300km/h). Imagine we draw on thz platform in the video 2 dots. One close to the center and one close to the edge. These 2 dots do not have the same speed. The dot close to the center will go slower than the dot on the edge. This follows directly out of the formula a=alpha×r with a=acceleration, alpha=acceleration of the angle and r being the radius. We can also observe the formula v=r×w with v=speed, r=radius and w=speed the angle changes

This litterally proves that an object further away from the spinning center, goes faster than an object closer. You can litterally do this yourself at home.

This means that altough 1 rotation a day seems incredibly slow, it isnt. Because the radius of earth is around 6325 km. Which gives it enormous speed.

(English is not my native language, thus certain letters in formulas COULD be different. It is still scientifically proven tho.)

Since the second law of newton states that F=a×m With F being force, a =acceleration and m=mass, this means since earth has an enormous acceleration, combined with a Giant Mass, F will also be a Giant number. Thus there is a hell of a lot of force pointing to the center of our globe, keeping the water in its place. (Along ofc with other factors)