After sending BKKFLYER a general inquiry about how this transfer is accomplished after the auction ends, he sent this reply:

bkkflyer (12)
Positive feedback: 100%
Member since: Apr-20-05
Location: GA,United States
Registered on: www.ebay.com

Item: American Airlines Platinum status for one year (140095790648)
This message was sent while the listing was active.
bkkflyer is the seller.
-------------------------------------------------------
Sorry, I can only tell you this is a corporate comp, and you will
receive the status. I will not be listing auctions after this as AA doesn't
appreciate me auctioning this, and I plan to respect their wishes.