The video that you handed clearly shows that you attempted RDMing him as you didn't own the district and you had no KOS signs.
And if you take a look at the rules it clearly says : 2.3 New Life Rule - "Police jobs are allowed to break NLR at the Mining/Police District or when attempting to stop an active nuke or bank raid" so technically, he wasn't breaking NLR. So for now, you'll have to stick to your warnings as they're totally valid.
This has been denied.

- Lock please.