What I know is this (pay particular attention to the key terms in the heading itself, "renunciation" and "minor"):
F. RENUNCIATION FOR MINOR CHILDRENParents cannot renounce U.S. citizenship on behalf of their minor children. Before an oath of renunciation will be administered under Section 349(a)(5) of the INA, a person under the age of eighteen must convince a U.S. diplomatic or consular officer that he/she fully understands the nature and consequences of the oath of renunciation, is not subject to duress or undue influence, and is voluntarily seeking to renounce his/her U.S. citizenship.
It is possible for a minor to renounce his/her own U.S. Citizenship.
Although common sense should dictate that the younger the person is, the less likely the diplomat or consular official would be to grant the renunciation, this U.S. citizenship law makes no mention of a minimum age. This tells me (and as evidenced by the law itself) it's left to the discretion of the US diplomat in Indonesia in the late 1960's.
All kinds of questions and scenarios come into play. Did Lolo know the US diplomat in Indonesia, and got him to help expedite the process? Was bribe money paid to obtain the officials OK or any number of other situations in a third world country back in the late 60's? Perhaps none of that was necessary and the official simply granted Barry's request to renounce his US citizenship because his commie world traveler mother convinced him that it would be better to become an Indonesian citizen. Who knows, except Barry.
I think the question remains...did Barry avail this law?