Yeah, it seems a bit strange. They have a chance to sell the Bitcoin above $100k. Why they sell now? I'm not sure if they have the intention to manipulate the crypto market. But it really brings impact to the crypto prices. However, it makes sense if all crypto coins are declining because they are following the downtrend of Bitcoin price.
Now, what they plan? If they are manipulating the market, they may plan to pump it by taking the advantage of Trump's inauguration in January 20. I don't know if it is true or not, but in my side it will bring advantage for us, too. Just prepare for the next pump, they won't expect for the correction forever.