ROE:”The parents’ social security numbers, for starters.”
I don’t know if social security numbers are typical for BCs issued today but I know they were not put on BCs back in the 60’s. You can even reference post #155 on this thread for a BC that was issued in Hawaii in the 60’s. I see no entry for social security numbers.
My wife and I were both born in the 60’s and neither of our BCs have social security numbers (and we were born in different states).
You’re assuming that whoever posted the .jpg knew all that. I suspect he didn’t put in weeks of research into the arcana of Hawaiian birth certificates in 1961 before deciding to black out the number.