Okay, thanks for your patience. I think we've hit the limit of what we can do at this point.
Nothing changed with your downvotes or comments. Going through kbin.social/u/{user}, I was able to view and delete PellyNews's threads. I am unable to do anything with the other two users. Even though I can see they exist, the relevant threads do not show up for me under their profiles.
I'll file the issue and keep just deleting what I can until things are sorted out on the backend. Thanks again for your help on this.