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Big numbers, but no sense. The outside weather shows that air is elastic not solid. Movement is not instantaneous. Objects in motion and all of that. Your statement doesn't work on water (or hold it) let alone on air. Indeed, when you set off an explosion, it is followed by a vacuum. It doesn't just push out evenly in all directions dissipating to zero. Explosions are in fact a wonderful example of the kind of pressurization we're talking about.

Your instantaneously equalizing world simply doesn't exist.

Your theory would also lead one to believe that pouring a bucket of water into the ocean would instantly raise the worlds coastal waters a molecule or two.

But your numbers are nice.

Nice strawman - you build that yourself? The point is not that it somehow happens "instantaneously", but that the air is going to flow from high pressure to low pressure. In your tube, that means flowing down the tube from the open end to the closed end. Whether it takes 1 second, 10 seconds, ten minutes, or an hour to equalize the pressure with the outside atmosphere is neither here nor there - the point is that it's going to happen, and that flow is going to move down the tube in the opposite direction of your payload and meet it at some point.