It's your question not mine. Your question is where is the code for NBC and I'm saying there is not one needed, as you acknowledged I'm not questioning whether they are, but whether they alone are.
So you acknowledge that they are but can't accept that there is not a law needed for them and because there is a law for all other types of citizenship we need one for the only obvious type.
No, what I'm not accepting is your position that citizens at birth and natural-born citizens are somehow different. If one is a citizen at birth then they don't need to be naturalized and are therefore what the Constitution calls natural-born citizens. If the Constitution identifies a third class of citizenship then I'm not finding it.