By the way, if he said he was Indonesian, by chance, in his Occidental years, wouldn’t that dual-citizenship status impact his ‘natural born’ status, even a little bit in your eyes?
I'm not sure what you mean. Legally, you are a natural born citizen if you were born a citizen, and that's all the constitution requires for eligibility. That makes dual citizenship is irrelevant.
However, there is no way he could be a dual citizen of Indonesia. Even if he were adopted by Soetero (and no one has proven he was), Indoensian law prohibited him from gaining citizenship unless he renounced his US citizenship. By the same token, US nationality law at the time (the 1952 act) did not allow minors to lose their citizenship. That effectively made it impossible to gain Indoensian citizenship. Period.
For this reason, his Occidental records cannot possibly have any relevance to his eligibility to be president.