Why? They hold somewhere around 200k BTC.
This might kill the price in the shorterm sure..
But it will get the Bitcoin into more hands, as thet've recently been selling dirrctly in the market rather than through private biddings.
It will also eliminate future worries about the U.S gov influence on price of Bitcoin; as they would've already sold them.
TLDR: BTC goes on sale, more people have it, safe from US gov action.