thousands of private messages, apparently no public content.

cc @ssb.organicdesign.pub @aran @pub.chuanyan.live

@aran

can I nuke all the data from those messages in my pub?

At present, not really. You could resync your pub's db, and since you unfollowed/blocked them (thanks) you would probably end up without that feed - but I wouldn't consider that necessary in this case. Here are references for the ongoing topic of deleting a feed: %1mgKdVg... %okZcNVC...