I looked the argument over, and it looks plausible, if he really was not born in Hawaii afterall. On the other hand, I think the law has been changed since then, though I don’t have the time to research whether it would have retroactive application. Doesn’t seem like it should.
Somebody upthread posted that the ‘5 years after the age of 14’ requirement was changed to ‘2 years after the age of 14’ and retroactively applies to Obama. But, if the birth certificate is legit it’s a moot point.