I wouldn’t consider that proof of anything, knowing that guys history of “not telling the truth.”
If it is “best evidence” in federal court, it could sway the trier of fact to conclude that BHO Sr. was married and the SADO marriage was bigamous, IMO. Kezia is still alive, BTW and could be persuaded to testify if it would save Obama’s citizenship by getting him declared born out-of-wedlock.
Only if SCOTUS adopts the claim by Obama's lawyers that the 9th Circuit Marguet-Pillado case makes Barry NBC could Barry's eligibility survive a Kenyan birth. Liars like BHO Sr. tend to lie opportunistically to gain some kind of personal benefit.
What possible motive would BHO Sr., who was dead broke, have for asking Mboya to look after his wife back in Kenya it he had been divorced in Kenya? Mboya, his fellow tribesman, would almost certainly have known whether BHO Sr. was married to Kezia or not.