No, not in this case. Despite recent rhetoric "terrorist" isn't just a word you can apply to whoever is fighting on what you consider the wrong side of a conflict. Terrorism requires that you employ violence and threats of violence specifically to try and coerce people through fear into doing what you want. Straight up fighting is not terrorism.
We, as players, have a special magical window into X6's code. He dislikes when you are "nice" or "generous" regardless of how it affects him and he likes it when you are "selfish" again regardless of how it affects him. It's categorical, you can't really spin that into misguided loyalty. He's just a short-form-of-Richard.