theres a limit for time (6 months?) for these via the website, and via the API theres a limit of 2000 or so latest comments, with no way to get the list of latest comments re-populated from older ones when your comments do get deleted. (They basically have a cassandra db for all the latest stuff, and an read only db for the old stuff. So the live db never gets updated from the old db.)
What this means is that your a lot of old comments and submissions are unable to be deleted.
Do you have a source on this? I'd love to read more.
It has already been running for a while now, and has gone back >4 years. I'm able to go in manually as well and modify / delete old comments. I've checked via incognito that they are actually modified, and then deleted.
What this means is that your a lot of old comments and submissions are unable to be deleted.