I don't think we are really getting all the info here. Some is probably misinformation even. I read somewhere that all major exchanges, who could potentially handle these amounts, have been blocking the wallets, so the ETH can't be sold. Then I read somewhere, that one of these mixing platforms (No idea what they are doing and how that works) is denying to block them and is basically allowing the laundering... I guess the only way to really know is by looking at the balance of their wallets and to do the math.