A constitutional requirement is not a red herring.
Being a Natural-Born Citizen is a constitutional requirement. But, exactly, what does that mean?
You have your opinion.
Others have their opinion.
And, so far, the courts have no opinion. And they ain't about to give one in the current circumstances.
Don't you think that, if having a father who was of another nationality, clearly disqualified one for the office of the President, somebody would've brought up the question prior to the election?
That the NBC angle is such a johnny-come-lately to the entire discussion suggests just how relevant it is.
It's a dead end.