Well, it's a good question. How do you define an injury, and how do you define an illness? Post-traumatic stress disorder is an illness. It occurs as a result of a trauma that somebody has been exposed to. If you were exposed to a trauma and you broke your leg, we would call that an injury; they were exposed to a trauma and they have a mental health injury related to that as well.
Whether you define it as an illness or an injury, I don't think makes that much difference, but if it allows people to accept it, come in for therapy, and get their treatment early, then it's useful. If changing the terminology helps us get somebody in early and get them treated, then I am all in support of changing that.