WHERE he was born is not important.
What is important, is that his mother was a US citizen at the time of his birth.
They made that bogus Hawaii birth certificate to perpetuate the concept that location of birth matters so that they can continue to legitimize anchor babies.
If you go on vacation to another country and give birth to a baby there, that baby is not automatically a citizen of that foreign country. The baby is a citizen of the country in which the parents are citizens.