This is imaginary wealth, or we can call it just ink on paper. Whether Satoshi is alive or dead, what is the benefit of all this wealth if Bitcoin remains asleep in the wallet forever?
Even if Satoshi were alive, I do not expect him to be able to move the Bitcoin stored in his wallet for a long time for several reasons, including that he has remained hidden all this time and cannot risk moving his wallet because all the world’s intelligence services will follow his movements.
Also, moving these huge amounts of Bitcoin and selling them, for example, will cause a huge dump and a decrease in the price, and this is what I do not think Satoshi wants.