Taken this by itself is not enough evidence, however, the shear accumulation of all the evidence seen as a whole makes a compelling argument that Obama was born in Kenya. From Michelle Obama who said that Kenya is his home country to the Kenyan Minister of Lands Orengo who said explicitly that Obama was born in Kenya.
Those two statements you speak of are more compelling than what zero says in his book that his mother said, meaning the subject of this thread.
But remember, it’s easy to deconstruct arguments in which no one piece of evidence can stand squarely on its own.
circumstantial evidence