Your prove in the video 6:11, the entire concept of flat earthian gravity relies on bouyancy and the relative density of objects in the medium. By your definition of gravity IT SHOULD NOT WORK and I repeat SHOULD NOT WORK under a vacuum, but jokes on you it does and therefore gravity cannot be a hoax. Here is just a short demonstration :)
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The thing is there is no medium, and it still goes at 9.81 m/s/s. It is all consistent even with an atmosphere if we account for small error of drag. Under your flat earth hypothesis objects of different densities should fall at different rates.
Also a quick analysis of your the video shows that the video is fish eyed and negates the curve, if anything it applies a negative curve to it.