That law states “citizen”. Nowhere does it state “natural born citizen”.
“citizen at birth = natural born citizen” is a myth.
No court and no action of Congress has determined that to be the case.
“Having extensively reviewed all articles cited in this opinion, as well as many others, this Court holds, consistent with the common law precedent and statutory history, that a ‘natural born citizen’ includes any person who is a United States citizen from birth.”
http://trailblazersblog.dallasnews.com/2016/03/pennsylvania-judge-rules-cruz-is-a-natural-born-citizen-tossing-eligibility-lawsuit.html/