Just because you have a (not so) clever way of playing with numbers, does not mean you are correct. Really, anyone can make the math appear legitimate. He also completely disregards the Minovsky Effect which amplifies light intensity as light is refracted by ambient particles in space.
Edit: The Minovsky Effect is a fabricated phenomenon. It's an uncreative reference to Gundam. A simple Google search would have made this apparent. If people do not research the claims of someone with no authority on a subject, how easy would it be for someone with authority to fabricate whatever lies they wish?
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Let's make a game show where a group of flat earthers search for the earth's edge.