Comment by Someone

I’m not sure I understand what you’re saying, but I think you’re misreading ”Different pieces of information, which collected together can lead to the identification of a particular person, also constitute personal data.”

What that says is that, if (A,B,C) identifies a person, each of A, B, and C, in isolation, is personal data, not that you will be allowed to keep the pair (A,B) if it doesn’t.

One mathematically can cut each bit of information in units of arbitrarily small entropy. So, if taken to the letter, “this user is not Mark Zuckerberg” would be personal data. I doubt jurisprudence will go that far, but we’ll see.