His family must have noticed he suddenly acquired a lambo collection.
Look at the blockchain. The Satoshi coins remain unspent. There is no lambo collection.
If one day they should suddenly start moving again, my computer will send me a text immediately and run a whole directory of other scripts that I've prepared and tested. I doubt that I am the only one.
Not spending the coins is the cost of remaining anonymous. I believe Satoshi fully intends to bear that cost for the rest of his life.