It has also been adjudicated multiple times that someone born on U.S. soil to parents that are legally within the United States are natural born citizens (and this also matches the definition of the term from the time it was written).
It has not been adjudicated this is the case if the parents were not legally within the US.
It has been adjudicated that they are citizens.
It has ever been decided they are natural born citizens.
Anyone with more than one nationality at birth is by definition not naturally an American.
It was that singularity of nationality the founders were requiring.
John Jay to George Washington:
Permit me to hint, whether it would be wise and seasonable to provide a strong check to the admission of Foreigners into the administration of our national Government; and to declare expressly that the Command in Chief of the American army shall not be given to nor devolve on, any but a natural born Citizen.