In my nonprofessional opinion, that is crappy aim. I can hit an apple from 100 yards away, with a black powder rifle, with an unriffled bore, with iron sights, standing up, repeatedly. I would expect a modern rifle with a riffled bore and a scope and a larger target to be much more accurate from a prone position.
The shooter had 1 target, and he delivered a 100% kill shot.
You could say "it wasn't impressive", but you can't say it was crap...
It was crap. I highly doubt the neck was the target. If the head was the target, then the same distance but in another direction, would have missed.
Regardless, it's still sad that someone died, especially in this manner (regardless of politics).