That isn't law. It is someone assembling a guide book based on his own feelings. If the feelings of a guide book assembler trump the Constitution and legislation, the guide book drawers would be the final arbiter of everything.
Surely you'd agree that someone can't be a natural born citizen of two nations. Which nation is an anchor baby a natural born citizen of if both parents are Mexican?
Natural born means born on US soil. McCain is no more a natural born citizen of the US than the many Panamanians who were born at the hospital he was born at.
The United States Code is the codification by subject matter of the general and permanent laws of the United States. It is divided by broad subjects into 50 titles and published by the Office of the Law Revision Counsel of the U.S. House of Representatives.