Why YSK: Because you may delete your account and find your comments and other content is restored and beyond your control.
DO NOT DELETE YOUR ACCOUNT YET.
Keep overwriting your comments over and over so they cannot just roll them back a single edit.
I prefer Power Delete Suite as it does not need authorization and just uses the website through your own browser. I will continue to overwrite my comments on repeat until the API changes.
If anything, it is probably a good idea to keep accounts open for the next few weeks and check on them periodically to see if the content restores on its own. If it does, you can then proceed to use the delete suite of your choice and run it again.
I suppose that once you are fully confident in deleting your account, you can do so. Alternatively, it might be better to keep the accounts open but delete all the content at this point.