That's the order book , it is not equal to the amount of money on that exchange.
Theoretically , they could still have more money right now than ever , if no one withdrew and since they sold all those bitcoins

.
Although i doubt that anyone will still keep their money on an exchanger following the news.
I don't work there so it's not like I can check the database. I'm just assuming this because it fits nicely in the time line.