Irrelevant, the reason an object falls in a vacuum is because there is nothing in the vacuum. If you put a helium balloon in a vacuum it's not going to rise is it?.. the helium is obviously going to be heavier than nothing, therefor it will obviously fall.
And just like with the coin falling through the air, a coin will also fall through a vacuum. Not because of gravity, but because it is heavier than literally nothing. Everything falls in a vacuum.
So again this does not prove gravity, it only proves that objects fall when they are heavier than the medium they are in. Your claim is completely invalid, no one can provide a practical demonstration for gravity, it's a theory, not a fact.
You also conveniently left out the fact that you must have a solid separation in order to create a vacuum, or the vacuum can't exist, i.e. a vacuum chamber. Vacuums do not naturally occur. So that again is another science fact that conflicts with the globe model of the earth.
Maby when a scientist creates a vacuum chamber with no solid separation between the vacuum and another medium such as the air that surrounds us, then puts a little spinning ball inside it with water and an atmosphere sticking to it, then I'l believe it. But until then, I'm afraid I'l have to stick with my practical, observable, testable, repeatable, demonstrable scientific reality. Cheers.