Moving his coins "by mistake"? What does that mean? Do you move your own coins "by mistake"?
Why didn't Satoshi move his coins back in 2021-2022, when the BTC price was around 59K? Does he even care about making money out of Bitcoin? Is he even alive? So many questions and no answers. The discussion about "what would happen, if Satoshi appears out of nowhere?" is pretty much pointless at this point, but random forum members keep asking the same question over and over again.
Even if Satoshi sells his one million coins, the Bitcoin market will head back to a bull run after several years of increased BTC supply.