Oh, the general public can go hang, of course. But the rebels, or the other whatevers, those he's currently quite concerned about. Would his clothes really give him away to them? Would anything else about him scream 'scan me for nonhumanity'? He's fairly human seeming overall. "Yes, it would rather depend on that. It's not exactly a difficult thing to tell, that I'm not human. But then, I don't know how well they check. What did they do to you?" How good is human tech at this time exactly? Yeah, no way does he know. Well, whatever. It's a potential plan to add to the pile, along with 'asking her to spy' and 'brainwashing her into spying'. At the bottom of the pile is 'find a way to crack reality like an egg', for the record.