Questions 12 and 20 seem to have incorrect answers. The correct answer is "no", but the comment says they were created by DALLE-3

I think it may be this article: https://labs.rs/en/invisible-infrastructures-mobile-permissions/

As far as I understand it (though it may be incorrect) - they won't be synchronized. Content between instances is synced/cached only when the instances are federated, and it doesn't go backwards - only posts after federation will be visible.