You don’t even need to look at the Nat. Acts of xxxx. Intent of law carries weight, especially when it is documented. The intent of the “NBC” was to prevent someone that had foreign allegiance from ever becoming the President. From that, NBC means born with only US citizenship and no other possible claim of citizenship by a foreign entity.
This is an argument that is too often overlooked; the fact that other "interpretations" do not serve the purpose for which Article II was created.