Denied.
The reason the warning is going to stay is that even after him telling you multiple times he was under NLR, after him not fighting back, and him even (falsely) using his physgun to emphasize his point, you continued to attack him. You should have gotten the point that he was under NLR, and he is, in fact, right, the Security COL job spawns there. The warning is valid.
With regards to Tyler, he should not have used his physgun off duty, he should not have claimed his own sit, he should not have had such a condescending attitude, and he should not have used that language against you. He will be receiving a stern punishment, and I will have a conversation with him.