It probably won't, but I don't think it disproves anything either. He's backing away from his car, but he's also moving in a direction where the truck might not provide cover for the officers anymore.
It might back the claim that he had an ankle holster too - if you look at his pants, his right cuff is bunched up well above his ankle. That would be consistent with the idea that he had pulled a gun from there (his left pantleg looks normal).
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