I’m not sure if it’s a coincidence, but I raised a case with the ICO in the UK, and today they got back to me asking for all my communication with Reddit. Also today - after a month of silence - Reddit also emailed me with this
If you’re in the UK and had been affected by posts being restored, I’d recommend contacting the ICO. It takes less than 5 minutes
It doesn't. A Reddit script just sends a request to delete the comment. At that point if the comment is deleted and then restored due to a timeout it is 100% on them.
It would be different if they would send back an error code without any changes being made, but the fact that the comment was first deleted is proof enough that their system received and at least started to process the call.