Maybe you better re-read the post over three or four more times, they sell the shares short then cover almost immediately from the company or from whom ever maybe selling at the time, ASYI
By this Notice, the actual sale INTO the market is a short sale because the market maker sold the stock into the market BEFORE they had purchased the stock from you. It is a technicality since they know there position will be closed out minutes later when they go in and buy your shares. To avoid doubling up on trade volume and distorting the picture, only the sale into the market (consolidated tape) is recorded and not the second leg which was the sale transaction between seller and market maker.