Yes, it's irrelevant. The "Certificate of Hawaiian Birth" was a special document only granted to children who had not had their births registered before the age of 1. The purpose was to provide a means to document children born in the rural and remote parts of the Islands where their parents were either ignorant of modern registration practices, or where these practices were too troublesome for them to bother. People forget that most of Hawaii, outside of Honolulu, was still a pretty backward place back then.
Obama had his birth registered within a few days of his birth, in Honolulu, as is cearly seen on his COLB, so it's obvious that he was never given a "Certificate of Hawaiian Birth." There was no need for it or point to it.