sorry, but you are just plain wrong.
it is impossible for someone to be born of a foreign national parent, on foreign soil, and still be a natural born citizen. they may claim US citizenship by the single US parent, but not NATURAL BORN citizenship.
title 8 section 1401 deals with citizenship at birth, not natural born status. a citizen at birth is not the same as being a 'natural born' citizen. it has nothing to do with the act of being born, but the circumstance of the birth.
put simply:
a natural born citizen is a citizen naturally... as there are no alternatives.
at birth, TCruz was a US, canadian, cuban citizen and possibly a british subject, depending on the common wealth laws at the time. obviously, he had a few alternatives (one of which, canadian, he relinquished last year)
Actually it is you who is wrong.
A person who does not need to be naturalized is naturally born a citizen. Citizen at birth means that they are naturally born a citizen and thus qualify as a natural born citizen. The very first Congress established this in their very first acts on the subject.