Sven, it doesn't seem as though you READ his essay. He pointed out quite persuasively that no man made law can define "natural" citizenship. That is defined as a characteristic of nature.
It is tantamount to asserting that Congress can pass a law making everyone's hair blond. As hair color is a characteristic of nature, no such law will change anyone's hair color. Therefore, no such law can change anyone's natural born citizen status. It is a function of the laws of nature, not man.
I did read his essay and took issue with “Types of Citizenship ...” That’s why I quoted it in the response. There is one type or classification of citizenship available and it is undefined, Natural born citizen.
You can be a US Citizen and not be a Natural born citizen and you must be a US Citizen to be a Natural born citizen. Attempting to define Natural born citizen classification through natural law or common law transgresses a specific classification to a term of art which fluctuates with current political headwinds.
At this time, we can only determine who is a Natural born citizen by eliminating those who are not ...
Non-US Citizens are not.
US Citizens who naturalized are not.
US Citizens who obtained their citizenship through statute are not.
US Citizens who have or have had dual citizenship are not.
US Citizens who had to swear an Oath of Allegiance to obtain their US citizenship are not.
etc ...