as an inventor of the bitcoin satoshi knows how dangerous if he/she/they spend that amount, of course satoshi won't destroy what he had built, i believe he still has another Bitcoin which he kept in a wallet that people do not know that the address belongs to him, just my speculation
thats very possible. he may even have another project, maybe another coin to which we might have been exchanging.
those coins he kept are just kept maybe for a very emergency needs. maybe someday, we'll see those coins moved to another address as a donation to a humanity project.
This could be possible.
Satoshi would have helped the world without even investing a cent.
Such a genius.