I doubt "googlability" is a factor in decisions about redacting PII like that. They probably have a blanket rule to redact private information like dates of birth, SSNs, etc., at least for living people.
You're most probably right but one might think it'd be just as easy to skip it for public figures (where the info is accessible for anyone anyway) but yeah, there's probably some legal mumbo-jumbo preventing them. I just found it a bit bizarre to see something as accessible being redacted.
