Your example of the Ark cite specifically describes people born OUTSIDE of the United States.
It does describe that, but the portion you need to direct your attention at is the fact that it says congress declares certain classes of people as citizens, by conferring citizenship on them at birth.
You need to acknowledge that having citizenship conferred upon you "at birth" (such as is done with foreign born citizens) is *STILL* naturalization.
People mistakenly think that just because you have citizenship conferred upon you at birth, this makes you a natural born citizen. No, you are still naturalized, but that naturalization is bestowed at your birth.