The market has already assumed that the 1 million bitcoins supposedly under his control are dead. If they were moved, not even sold, it would prove they were still active, immediately adding 1 million bitcoins to the assumed supply and the price would crash. Whilst he would never be poor, he could never sell for anywhere near $5 billion.
That’s the joy of blockchain. We know the history of each and every coin.
RE: Satoshi's nest egg is worth a cool $5 billion at current prices