Actually, Cruz’ father was not a citizen of Canada, but a citizen of Cuba. His permanent residence was in the United States. And the Act of 1790 is citied only because it provides historical context for we originalists that “Natural-born citizen” meant “citizen at birth,” not because it is controlling legislation. It’s been supplanted about a dozen times since then.
Actually, when he went to Canada he applied for Canadian citizenship and got it in pretty short order. Either way, he demonstrated that his loyalty was not with the United States.