He lost that birthright with Kenyan independence. His British birthright was transferred to being Kenyan citizenship. Thus the way the posted ad states it is wrong. In trying to make the overall valid case, it is not an idea to state things known to be wrong.
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Your missing the point entirely.
How can a "Natural Born Citizen" be born with foreign citizenship?
Let alone, hold two foreign citizenship's and thus allegiances at any time of his life.
My point is simply what the ad states, and it is wrong. My point is that in trying to state an overall valid point, it is not good to screw up the simple factual details. It hurts your cause.
IMHO, when BHO, Jr. reached his majority, he had the choice of choosing British, Kenyan, Indonesian, or if he really were born in Hawaii, American Citizenship.
A Natural Born Citizen would have no such choice.