Who do you suppose wrote the article that you either didn’t read, didn’t comprehend, or both? You haven’t had the relevant training, btw.
Did you write the article?
So you have the expertise to be able to state that the definition for deadly force and its application (by both DoD and the State Department's Bureau of Diplomatic Security standards) significantly differs from local police? It doesn't.
Guess who trains the Marines for embassy duty for arresting and applying deadly force on embassy grounds? Federal special agents. The only difference in the deadly force taught for guard duty in the infantry is the baton, the mace and the handcuffs that are issued for embassy duty. That's it. The rest is paperwork.
So deadly force has been preached into my soul for 20 years. I know what it is, how it is applied, and I can tell you the cop is going to jail because he misapplied it. It is only a question of what he pleas to, or is found guilty of. My money is on manslaughter because it's a misapplication of deadly force, so it likely won't meet the standard for Murder 1 or 2.