Hello,
Thanks for your reply. I just tested again to make sure what does and what doesn't work. I created a test account, and made a post in a forum. Then requested a deletion, and confirmed it.
The CB fields are properly deleted now from the SQL database, so that problem is solved.
The posts on Kunena, however, are not removed/replaced. The content of the post remains, and the name of the poster remains too (just no longer clickable as the associated profile has been removed).
I tried running the tools in Kunena itself, but no effect.
The site admin account details I had provided on top are available, so you can use them to test.
Thanks.