you’re right - he doesn’t THINK like a citizen..
But I believe I read that if a child’s parents declare him to be a citizen of another country, he is not to be held to their decision...and has until his 18th or 21st birthday to re-establish his citizenship??
Maybe he ‘missed’ the cut-off date...
You may be right for all I know.
We can certainly see what comes from being exposed to other cultures as an impressionable kid at the very least.