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I might just be overly critical, but I've read enough forum staff horror stories (and dystopian novels, for that matter) to instantly be concerned when there's a clear lack of transparency and hush-hush and the need to expurgate conversations.
...Actually, after a curious visit to the Rules section, I can find a rule that prohibits asking staff why members have been banned (as I remembered from the last time I read these), but from what I can see there's nothing to stop users from simply "discussing banned members", as you put it. I found that deleted posts in the DCC were tagged "banned member discussion", too. So there's clearly a well set in stone idea about this amongst the staff, but unless there's some insinuation in the rules somewhere and I'm terrible at reading comprehension (which of course could be very possible), this does not operate from any public, central decree. This is actually getting really interesting. My detective senses are tingling.