Adam Back suggested that the emergence of quantum computing could force Satoshi Nakamoto to move their Bitcoin to protect it, revealing whether they are alive.
There's many if for this to happen which are
That's if he's still alive
That's if he still has the keys
That's if he cares about re owning such number of Bitcoin
And lastly that's if he's stupid, which statistics has shown he isn't.
Quantum computing isn't some magic word like Abracadabra or open sesame.
Bitcoin security isn't the only thing at risk. The world is.
I would also add
That's if he don't want someone else to steal up to 1 million Bitcoin
That's if he don't wish Bitcoin price crashed
In addition, it's based on assumption Satoshi mined up to 1 million Bitcoin.
While there's good analysis about which Bitcoin presumably mined by Bitcoin, there's no guarantee it's 100% true/accurate.