... and it is unlikely that the remainder will ever be spent, although the question remains why Satoshi didn’t simply burn them in this case.
Take note it's not impossible Satoshi get random 256-bit binary
as public key and use it to generate burn address.
Yes, it's possible. Now we have this unsolved situation because Satoshi changed his Software so, that we can separate his mined blocks and the coins from others. Some Bitcoin participants want to know why and that also leads to:
https://news.bitcoin.com/online-sleuths-believe-satoshi-nakamotos-bitcoin-stash-is-a-blockchain-treasure-hunt-meant-to-be-found/. And that is not impossible.