Hi @MichaNykiel, three different staffers have said that, across 2018, 2021 and 2022. epehrson first: “if you replace any user identifiers in those user properties by account IDs, then you will not be storing any personal data”, with the Yes required only “as long as you store user keys or usernames or other personal data in user properties”. Then ibuchanan’s reversal, which you quoted. Then AdamSlaski: “AccountId is a personal-data-free replacement for the username”. The only staff post going the other way is ibuchanan’s own first answer, retracted two days later. I think three of them agreeing is about as settled as this room gets.
You will not get a fourth though. Nothing since 2022, and @tbu asked ibuchanan to reconfirm on 54402 this February with no reply.
I have nothing solid for your question 2. Every erasure sentence I found is written about the personal data held against a closed accountId rather than the identifier, which fits your Former user reading, but that is my inference and not something Atlassian has said.
Edit: fixed a quotation. I had “… you can select No” inside epehrson’s quote marks and he does not say that anywhere - it was my own reading of his Yes condition, and it should not have been dressed up as his words.