Ann: Ceasing to be a substantial holder, page-14

There is no way they sold 5.6 million shares on the 10th September!
Total trades for that day was 1,020,074 shares and there were no X trades listed either.
Does this then indicate that they had been selling the 5.6 million over the last month without notifying the ASX of it within their rules?
No other company or entity has announced buying those 5.6 million!
Does this explain why our share price has been declining recently?
OR, am I missing something here?
Can someone enlighten me?