The "edit comment" feature, whether paired with deletion or used by itself, does not work due to hitting rate limits. The developer is aware, but don't have capacity to fix it atm.
Some forks fix it. I didn't have the patience to figure out which ones did, which ones worked, or how do use their modified versions, so I made my own fork including a working "release" of sorts. It it rate limited to wait 5 seconds between each edit:
I did not try, but it's proooobably hitting a serverside rate limit. If you have the option to inspect the network responses, they may have some information.