The ONLY reason to seal a birth certificate is after an ADOPTION. The “orginal” certificate would have been sealed when his name was changed to Soetoro at the same time he became an adopted son of an Indonesian citizen.
Damn good point!
In those cases it's sealed from folks who could normally access it, such as the person themselves, and the adoptive parents and other relatives.
But Hawaii law provided for only a short list of persons who are eligible to receive a copy of a "vital record" which included marriage certificates as well as birth certificates. John Q. Public is not on it. However a court order can give access to a court.