After discussing with multiple people about authenticity of the leaked DoomsDay footage, it matches up with what was shown at CinemaCon.
It is real, it simply has unfinished VFX effects.
This is the copy I received earlier, I will be deleting it soon.
Avengers Doomsday Leak
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https://t.co/oWNa7nfSYW Part 2 of 160th Anniversary of Strong Vincent and his actions at Gettysburg. Thank you again to Tom Hansen(Strong Vincent reenactor), George Deutsch( the smartest and knowledgeable in local and 83rd Pa history), and all the local Erie reenactors.
https://t.co/Z7vkdmUNeF
Video I took from today's event. 160th Anniversary of Col. Strong Vincent and his actions at Gettysburg. Thank you to Tom Hansen, George Feutsch and local reenactors. This is part 1. @fifer1863#Gettysburg160#eriepa#strongvincent.