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I believe he will. In order to not inflate the price of SBD he has to wait until SBD is at the peg or below, to burn anything. At this point he is selling it and powering up the account.

They are added as a reply to each top level @burnpost post, posted soon after they pay out (a week after the original post). Look here: https://steemit.com/@burnpost/comments

As @whatsup stated in the other reply, under the stated rules, the coins are powered up for now, designated for burning later (with the SP used only for anti-spam downvoting until then). The funds will never reenter circulation.