How do you think Reddit is restoring posts that people have been deleting?
Do you think Google’s deal simply allowed them to scrape old.reddit? Hell no, there is probably a live replica of Reddit prod at Google somewhere, including deleted posts and all edits.
You don’t think they paid $60m just scrape, do you?
If they have access to Reddit’s database then they have all the previous versions of everything, including deleted comments and deleted accounts.
You don’t think they paid to simply scrape, did you? They already do that.