Unless you are a friend of his then you are never going to be able to tell when a whale like that makes those kind of movements, you need to understand that they will try their best to try to hide those movements and this is because if everyone found out he was about to buy bitcoin then the price will go up even before he does.

This means he will have to pay more for each coin and this is obviously something that no one wants to happen to them so they use different exchanges, accounts, companies and different time frames to hide this from the general public.