PowerDeleteSuite doesn't get everything, particularly on old accounts. PDS uses your New, Hot, Top & Controversial lists on your profile - however reddit has been limiting the length of these lists for a few months now.
For example, if you have a link to one of your older Top comments, you might see a bunch of low karma replies underneath that PDS didn't touch.
The only real way to get everything is to do a GDPR request and use the links in there. Shreddit can do this (in particular the github version, the website charges $15 for the feature), however even then it will panic and stop part way through. I've had to edit the files and split them down, and even then I haven't yet finished. Shreddit uses the API though, so it won't work after 1 July.
Also reddit have been restoring some comments evert couple days - you might find some that PDS removed have returned. Supposedly this is to do with how reddit's CDN structure works, but that may also just be an excuse. I wouldn't be surprised if reddit tries to claim ownership of everyone's comments and restores most if not all of them, so those google searches might start working again.