Have you found another legal document from them that states it differently? Not an opinion of different individuals, but a legal document from the founding fathers?
Yes I have, It's called the Naturalization Act of 1795, which, with the lead of then rep. James Madison and the approval of George Washington specifically changed "shall be considered as natural born citizens" to "shall be considered as citizens of the United States."
So it did not define the term then.
Do you think they were confused in 1790?
From your link:
Not much information exists on why the Third Congress deleted “natural born” from the Naturalization Act of 1790 when it passed the Naturalization Act of 1795. There is virtually no information on the subject...
The rest was just guessing by the Author.
I particularly like:
Additionally, the 1790 act was a naturalization act. How could a naturalization act make anyone an Article II “natural born Citizen?” After all, a “natural born Citizen” was made by nature at the time of birth and could not be so made by any law of man.
If it is not dependent upon law, exactly what are the citizen of? The country is formed by the laws passed by the government.