It's important, this. With rumours of posts being undeleted and the like, it seems that Reddit are fudging their content somewhat. BUT: in theory I expect that the GDPR would protect those covered by it (not me, in the UK, post-Brexit ☹️) from this, and anything deleted must stay that way?
Dunno if there's gonna be more fun on this front in the future.
We had this on our instance. Hopefully this solves it on yours.