In my opinion, Satoshi cannot withdraw all of his Bitcoin because he would put his beloved child (Bitcoin) at risk. I mean the risk in terms of a price drop, and I don't mean, of course, an existential risk to Bitcoin.
This possibility is unacceptable for several reasons. First, Satoshi knows that if he sells all of his Bitcoin, it will lead to a significant price drop. Second, if he wants to convert it to cash (which goes against Satoshi's principles), he could jeopardize his privacy and reveal his identity.
If Satoshi wanted to sell his Bitcoin, he would sell it off the market in batches to avoid affecting the price and jeopardizing his privacy, although I suspect he wouldn't.
I would ask the question differently: who will let Satoshi do this if he is still alive?
https://intel.arkm.com/explorer/entity/satoshi-nakamotoThis is a very huge amount, and if Satoshi decides to sell something for a large amount, then a real hunt will begin for him.
BlackRock will soon surpass Satoshi in terms of the number of bitcoins it holds. Are you afraid of this too?