That doesn't matter. Kenya could have laws making anyone with more than 1 part in 13 Kenyan heritage(whatever that might have been before the British Colony was established) a Kenyan citizen at birth. Or they could have no laws affecting those born of it's nationals outside the country. What does matter is that BHO Sr was not a US citizen at the time of Jr's birth. That means, that if Jr was born in Hawaii, he's a citizen, but not a natural born one. If born anywhere outside the US, and born before his mother was 19 (she was several months short on the date claimed) he's not a citizen at all, unless later naturalized. But either way, not natural born.
A nation may make foolish laws and whimsy, there is a law of nations, an ideal beyond the faddish reach of such folly. Under that law, Obama is Kenyan. There are very fews birth fact we know for certain about Obama. He was born around 1961 give or take a year or so — that’s a certain fact confirmed by early photographs. His mother was Stanley Dunham — that’s a well attested biographical fact. “Well attested” meaning accepted by all parties, and long established as an attestment and documented attestments, see for example the student enrollment book from the Indonesian grammar school. His father was Barack Obama, the Kenyan. That is also a well-attested fact, although there is less attestment, and there is also a seed of doubt, due to the lack of some key papers — such as a marriage license, and the lack of eyewitnesses to the marriage and to the cohabitation of Stanley and Barack, and as well some questions as to where he and she lived just before and after Obama is said to have been born.
Three facts only. And the last mentioned one with a seed of doubt.
And as you say, that last fact means Barack Hussein Dunham-Sutoro-Obama or whatever alias he has taken on at times is not natural born in the sense of that term in the Constitutional qualifications for President.