From the article:
“....and naturalization at birth of certain classes of children born abroad to citizens.”
You are NATURAL BORN CITIZEN or you are a NATURALIZED CITIZEN (rules change over time via Congress).
Cruz is the latter.
Rules DEFINE natural born citizen.
Rules do not naturalize a citizen who is natural born by definition.
Congress = power to DEFINE.
Citizen by birth. Born to American Mother. Citizen WHEN born. Birthed a citizen.
Means, not requiring naturalization.
BORN AMERICAN.
Cruz knows it.