Please educate yourself by reading Title 8 Section 1401 subsection G. You will find that Mr Cruz was a citizen at birth and thus qualifies as a natural born citizen.
You cannot educate yourself by reading misinformation. All acts of Congress are subservient to US Constitutional law. The Constitution GRANTS power to the Executive, Legislative, and Judicial branches of the government, it doesn't work the other way around.
Section 1401 Subsection G does not determine what is a "natural born citizen." It simply states who is a citizen as decided by Congress exercising their power of naturalization.
I will also point out to you that the section you quoted says this.
a person born outside the geographical limits of the United States and its outlying possessions of parents one of whom is an alien, and the other a citizen of the United States who, prior to the birth of such person, was physically present in the United States or its outlying possessions for a period or periods totaling not less than five years, at least two of which were after attaining the age of fourteen years:...
So what kind of a citizen do you have if born in Canada to a 13 year old mother?
How does a law make you a "natural born citizen" if the mother's old enough, but not a citizen at all if she's not?