The coins in satoshi's known addresses have been left there and not moved. It's possible that satoshi is afraid of doing so due to fear of his identity being tracked, or that he no longer has access to those addresses.
It could also be that he simply doesn't intend to sell, and would rather spend the coins when he can (after all, he did create a "peer-to-peer electronic cash system" - why he would sell his real money for fiat I have no idea).
Also, the 1 million figure is quite unlikely to be true, and the couple of hundred thousand that he most likely has in reality would not crash the market as severely as you think, especially since it's extremely unlikely for him to offload all the coins at once and that even if he did, it wouldn't be the end considering trading volume of >1 billion dollars these days.
P.S. I also think the "Satoshi risk" is one of the main reasons why the Bitcoin ETF was rejected.
The SEC were extremely open about their reasons for rejecting the ETF, and are a traditionally conservative institution. I think this is childish reasoning from you.
P.S.S. Satoshi, if you are reading this, please come back and express your views on how this scaling issue should be addressed
As if no one's asked that before...