Laundering is the process of making dirty looking money legit. This isn't particularly good way to do that. When the miner sells the $23 million, it isn't hidden to the normal income because the amount is so large. They have explain it to their financial service providers who will request explanations. Their investigative team will easily do blockchain analysis and find the transaction. If the sending address is in any way connected to the miner, the "scheme" will be bust.

I don't think there is any money laundering going here. The point of money laundering is to raise as little attention as you can, and that is not happening here. Weird transactions and income makes you just more suspicious.