That's simply an unsourced opinion. Your status as an American citizen is in no way based on the laws of other countries. If you agree with this argument, then you are letting other countries override our laws. We have no control whether another country considers an American to also be a citizen of that country.
A child born to an American mother and alien father could be said to be a citizen of the United States by some affirmative act of law but never entitled to be a natural-born citizen because through laws of nature the child inherits the condition of their father.”
AFAIK, US law overrides some nebulous concept of "laws of nature" and there is nothing in US law that disqualifies a dual citizen from the Presidency.
According to our Constitution, Obama must be a natural born citizen to serve as President. Born in Kenya would not meet this criteria, nor would changing to Indonesian citizenship as a child to school in Indonesia. WHEN will we see his original birth certificate? WHERE was he born in Hawaii if he weren’t born in Kenya?