In that video they already had guns out and pointed at him. A group of unmarked “cops” shouldn’t be allowed to draw weapons and surround your car on a seatbelt violation. The second they all showed up with weapons drawn I would consider his shot self defense.
They shouldn’t even be approaching the car until a uniformed officer is on scene to vouch that these aren’t just some Proud Boys (or any similar group of wanna be paramilitary out LARPing) playing cops.