The article to which you linked got it wrong wrt 0; his mom was not old enough to convey us citizenship :
“..... In regards to President Obama, if the “birther” theory had been proven correct (and I’m not saying that it is) in that he had been born in Kenya (instead of Hawaii) to his U.S. mother and his Kenyan father, he would still qualify as a natural-born citizen. ....”
It’s elementary……Without 8 U.S.C., Chapter 12, subchapter iii (nationality & naturalization), he wouldn’t even be a US citizen. You can’t be a naturalized citizen and be natural born. Natural born citizens do not need US law to make them a citizen. The whole point of 8 U.S.C, Chapter 12, is to cover people who aren’t Natural Born.