The title doesn’t refer to a question. It means the nation believed he is Constitutionally qualified. If he’s not, he deceived that Nation.
He never had to address the nation on this issue. It never came up during the election and once he was sworn in (almost) no one will touch it. Anyone legitimately criticizing his policies is accused of being a racist, imagine what the response would be from challenging his birth. The big problem with the issue is it revolves around his birth. Even if you could prove he was not born in the USA you would have to prove he knew he was not a citizen to make it a moral issue at all. That would be like having a recording of his admitting it but saying he doesnt care. Legally, it's dead.