Isn’t the issue here that his U.S. citizenship had to be renounced to attend the indonesian school? And you don’t get it back technically?
I'm not well enough acquainted with the immigration and naturalization law concerning that to comment, but I have seen comments here with links to the statute law that cover that.
The Indonesian citizenship question is only one of a great many troubling inconsistencies with Obama's past. There are far more questions about The One Enigma than answers.