Apparently, storing such a large amount in one SHIB wallet, and even more so making some transactions in the future, when this amount of coins is estimated at several billion dollars, is already very dangerous. Therefore, dividing the content into several wallets is quite advisable. However, splitting the coins into four different wallets is indeed likely an indication that the whale is going to partially sell these coins.
Various similar actions will always cause similar fears among users and it will someday really cause the price of this almost useless coin to fall.