You make a good point. It shows two things, and oddly the second one is more illustrative of what happens in a true SD situation.
First, it shows that the law is applied differently if you are a LEO or a government official. They just couch the report differently and find ways to not see an 'error' (i.e. if he had the gun the threat was no longer there and he had no reason to shoot).
The second point is that in a true SD situation people do things in extremis that an ordinary calm person with time to think, not being scared, may not do. For example people emptying their HG and continuing to squeeze the trigger on an empty gun (revolver, or single-action). The BG was dead at the second shot - there was no reason to keep shooting. OMG, you can't apply REASON when you're terrified and not in control of your actions. Yet we citizens are held to this higher standard when you think about it and LEOs are NOT. Notice when they confront a guy who raises a gun in a scene where there are ten officers hiding behind their squad cars, does the guy get shot once and dropped thus STOPPING the threat? No, all ten unload their entire magazines and it's considered a 'good shoot'. If a civilian and his partner did that, and shot 40 times, and the coroner says the second shot killed him, they'd be brought up on charges for aggravated something-or-other.
So, in essence, I understand why he shot the guy. He was in fear-mode and not really rational. I think it qualifies, though not 'on paper' as a good shoot because of that.
$.02