You should bear in mind, PowerDeleteSuite doesn't get everything. It can only see what's in your reddit profile under New, Top, Hot & Controversial - there will be numerous posts that are too old with only 1 or a few karma that aren't displayed in these lists. In particular, if you go through your top posts of all time, you might find some replies to these posts that you made that the script did not see.
The GDPR archive gives a full list of all the comments. What we need is a FOSS script that can use these csv files to get everything. Apparently Shreddit can take the csv files, however you have to pay $15 to use this feature.