Cruz was, unquestionably, a natural-born Canadian.
But the US does not recognize (with very few exceptions) the effect of foreign laws on the citizenship status of US citizens.
Now, if I was a judge and you put before me the question, “is a person born to an alien father in a foreign land an NBC under Article II?”, I would say no. But what Canada had to say aboot it would not affect my decision.
That is NOT what the 1965 Immigration & Nationality Act says, it specifically calls attention to the laws of the foreign states as having complete jurisdiction over the nationality of children born to their citizens and thus children born in wedlock, to fathers who are foreigners are, for purposes of the 14th Amendment & Title 8, Sec 1401 of the US Code, these children are aliens at birth, no matter where they are born.