..it was never doubted that all children born in a country of parents who were its citizens became themselves, upon their birth, citizens also. These were natives, or natural-born citizens, as distinguished from aliens or foreigners. Some authorities go further and include ... children born within the jurisdiction without reference to the citizenship of their parents.
By saying "as citizens," Waite makes it clear that he's NOT including this class as NBCs. Otherwise, what is the point of mentioning citizen parents or the citizenship of the parents if BOTH can be regarded as NBCs?? Why make any distinction at all??
I think that if there is a question, and obviously there is, NBC should be defined unambiguously. NOW!