“To me it means nothing; the US does not care what another nation claims on you, only what you claim for yours. If another nation claims you as their citizen, and you do not recognize that claim, then that is good enough.”
“...the US does not care...”?
You appear to have made this up as the founders certainly did care. See John Jay’s letter to Washington which appears to have directly resulted in the NBC clause in the Constitution.
"That same act [The British Nationality Act of 1948] governed the status of Obama Sr.‘s children."
That's a pretty good indication that he knows he's not a natural born citizen of the United States.