I found I had to run it multiple times. I also found that while it removed everything from my profile, a Google search of my user name & site:Reddit.com showed a lot of comments still there. 30 pages of search results in fact. There was not really any pattern as to which ones had been kept. Was quite cathartic going through them and over writing with gibberish a couple of times before deleting.
There was some discussion here about this issue. https://www.reddit.com/r/privacy/comments/14dcxy4/reddit_restored_the_last_six_months_of_my/
For anyone who hasn't done it yet, better get on it as most of the useful deleting tools also use the API. I would also suggest the first few runs of power query you only edit the comments, not delete. That way you can get an idea of how many it got vs missed.
I'm guessing you also have to spring for their tickets to the rave/doof/club event as part of the package?