>>> A face is a unique identifier.

>> Guess you’ve never heard of twins?

> Guess you’ve never heard of names? Or date of birth? Personal doesn’t mean unique.

Your parent commenter is contesting the "A face is a unique identifier" part. They are not contesting "A face is personal". Of course face should be PII but at the same time it is not a unique identifier, so your parent commenter is correct and you are correct too. But you are replying to an objection that was never made.

I quoted the exact part I was commenting on, maybe you missed that?