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A battery may test fine, it depends on the tester. I've seen batteries that would test fine on a non-load tester then drop off a cliff at 9V draw. Not all testers are created equal.
From the video and what you wrote above, it looks to me like you just have a bad battery. It'll take a good surface charge and maybe even a somewhat deep charge but when a good load is put on it (starting is a huge load) it'll fail.
Have your alternator actually tested when you put the new battery in. Tested WITH the new battery installed.
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