this doesn't cut it. someone could take a list of email addresses, hash them, and then reidentify the dataset. hashing buys you nothing from a gdpr/ccpa compliance perspective, storing the hash is seen as no different from storing the pii itself. it really only makes things harder because it becomes more difficult to find where all the pii is when someone submits a request for you to return or delete their data.
Do you have a source for this?
I thought for the gdpr it was enough that data is not easily accessible. For example, it is not necessary to delete PII from backups unless they can be automatically restored (and are reasonably encrypted). Hashing PII thus falls under this category.
