Here is a comment I posted in response --
As you correctly, though indirectly, point out, being a natural born citizen is not about *where* a person is born.
At the same time, while this is true -- “This is the simple and indisputable definition: Two citizens who have a child, naturally create a new citizen. This is a Natural Born Citizen” – it’s actually the case that it is true because natural born citizenship is inherited from the father; this is what the Founders understood and meant by the term.
These days, as people want to pretend that sexual egalitarianism is the truth about nature and about society – if one can even get them merely to admit that the above is what the Founders understood and meant by the term – people will tend to assert that natural born citizenship can be inherited from either parent … never mind that no law (*) has ever been enacted to so change the meaning of the term. BUT – and what such people will then *refuse* to acknowledge – if that were the case, then a person so born of citizens of two different countries would be a “natural born citizen” of two different sovereignties, which is a logical impossibility: or, as you put it, a “mule”.
(*) I question whether Congress even has the power to make such a change to the meaning of the term, absent a Constitutional amendment.