A citizen of the United States at birth BY statute is a naturalized citizen.
A citizen of the United States at birth BY birth is a natural born citizen.
In your mind, I’m sure that’s true; but no court and no action of Congress agrees with you.
Since the 19th Century, a naturalized citizen is issued a Certificate of Naturalization. If a person is a citizen and was not issued a Certificate of Naturalization, then they are a Citizen of the United States At Birth and eligible to assume the office of President.