Bitcoins are safe on the exchange, but such moves negatively impact the sentiment about Bitcoin. If I am a Chinese crypto investor, this effectively tells me that if I want my money back immediately, I should sell my bitcoins and withdraw CNY. I might listen to that.
No offense, but unless you are working at BTCC maintaining their wallets, their is no way you can know that for certain.
It is just like cryptsy , we had no way of knowing until they default or start releasing withdrawals.
FYI:
Moral of the story , Never Leave more Coins sitting on an exchange than what you are willing to LOSE !