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In answer to the other question, no... I cannot prevent him from posting in this single club, but I CAN prevent him from accessing the Clubs forum altogether. If it happens again, I'll probably consider the option at that point in time.
edit:
A bit pointless to create a new post to say this, but I hadn't initially realized that he had posted again just earlier today... so I went ahead and blocked his access masks for this section of the forum. Looks like he won't be hassling you guys any longer.