PowerDeleteSuite doesn’t get everything. It only goes through your New, Hot, Top & Controversial lists, but reddit has been limiting the comments available in these lists for a few months now.

For example, if you have a link to an old Top comment, you might find several low karma (but positive) replies underneath that reddit didn’t touch.

What you need to do to get everything is make a GDPR request and use the csv files with shreddit (the github version, not the website). The GDPR files contain links to every single comment, so you can get everything. However shreddit uses the API, and almost certainly won’t work after 1 July - also reddit seem to be stalling on following through on GDPR requests now.

Lastly, some comments have been coming back after being deleted by these tools. Supposedly this is to do with reddit’s CDN architecture, but who knows. I wouldn’t be surprised if they restore a bunch of comments on 1July, then if your account is already deleted you will struggle to do anything about that. It’s probably a good idea to retain your count for the time being, so that you can confirm everything is still gone.