YSK if you overwrote your comments and posts that Reddit is restoring them to previous states
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.
I've heard that if you tried to edit a comment in a community that had already gone private, that it could prevent you from editing it. Are you sure you were able to edit and delete the comments you're seeing? Normally if you delete your account without editing/deleting, the comment stays up and it just changes the username to deleted. I used Power Delete Suite on Sunday and don't see any of my comments have been restored, but most subreddits hadn't gone dark yet on the 11th.
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.
I am 100% certain that my comments were reverted. And I am not the only one reporting restored comments. Multiple people have replied saying they are experiencing the same.