I would be fairly surprised if any current AI would have an ethical framework to evaluate its own actions or even any formalized rule system that comes close.

So they warn that decisions by AI should be reviewed, they write "Some AI scenarios present ethical issues". Maybe just to protect themselves they state the obvious.

Looking into the future I could imagine misbehavior to be blamed on AI. Having a handler in such cases might be a good idea, otherwise we might see a lot of cases where people try to shed responsibility.