They maybe sold some big portion of it, but if they did sell all of their coins as some of people speculated here, isn't that good though? basically one more threat that holds back btc growth eliminated so we can have a smooth as silk bullrun in the future.
Basically a bright future since no more manipulation, fud, etc by just one corporation.
I think for something big like that, especially bitcoin address which can traced, they might be not sell their coins yet but want to buy more. But that is only my personal opinion. Because usually if a big amount of coins deposited or moved to exchanges, there will be a news and no big news yet (or me who don't know yet) but not see any article about it.
We don't even know what address they are holding the BTC, big fat chance it's gonna be in custodial service where there's insurance but thats just my speculation. They could slip to the market and no one gonna even notice if they gradually dumped it without trying to leave any trace.