I am sure that it will be spread out eventually. Coinbase does like to move money around and they have so much money, like insane amount of money that it is normal for them to switch it around time to time for protection. When you have 3 billion dollars just on one account, I am sure that someone could spend a few million dollars to buy some computers (and a few million dollars worth of computers would have "some" power) then you could use even brute force, or any other way to crack into it.
I am sure it must be still near impossible but it is still better to be safe than sorry which is why they keep on moving these one by one, and then probably will spread it out.
Definitely, they are doing some precautions because the amount is huge.
We don't know the steps they are undertaking and for sure they won't disclose it to the public.
But media is really not doing deep research before publishing their article.
It is not a new whale but one of the top exchanges. They can give a different notion to the public.