I know for a fact that (so far) one post and at least one comment (there may be more, I'm still going through) have been restored. How do I know this? Because every single post and comment I deleted, I edited with "DELETED - GDPR" first and then deleted. I did all this systematically. I knew that if I saw any post or comment with that text, it would mean it had been restored. And now, today, a few days after that post and comment were edited and then deleted, they're back with the edited text. This is also well with that 1000 post comment/limit too.
This time I've taken screenshot first and deleted again. I've also recorded video of me editing and deleting a comment. If that one comes back as well, I have proof.
All my edit/deletes have been over several days so it's not like I'm hammering the servers and causing them to glitch out on deleting correctly (I fully refresh the page after anyway to check deletions have indeed happened).
Edit: typos