I'm now seeing reports over on !RedditMigration that people who have deleted all the comments from their accounts - even those who did it years ago, not just in the past few weeks out of protest - are having all their comments reappear again. This apparently also includes comments that were overwritten with edits.
Scummy behaviour from Reddit, but a potential boon for archivists. People who are running backups or maintaining archives of Reddit comments might want to take this opportunity to re-check historical deleted comments to see if they can be collected now, in this remaining window of API accessibility.