100 per minute is faster than the speed at which I deleted my history. So I guess we can still help people deleting their history.
I used the archive which is shared around and extracted my posts to get the id of my comments and deleted those, like 30 per minute. But I guess that if we rebuild a database with the author as a key then we can pretty quickly return a list of id's based on an author. Then the user can feed this list to a python script by himself and delete himself.
What I couldn't do in time is edit the posts as I ran in some weird index errors that I couldn't bypass.