Yeah, but if Satoshi - or anyone - finds the keys again (I'm fairly sure the keys are lost tbh), I doubt they would try and move it in one go.
Also, again I'm no expert but, I think the mere news of the BTC moving from that wallet would have much more of an impact on the BTC price than the BTC ending up on the market.
The crypto market is highly irrational and influenced more by memes than straight supply and demand. I'm confident that the crypto news sites are all owned by people holding crypto. If I had a ton of money and a lot more to gain, I too would invest in paying or setting up media outlets to try and direct the price upwards even further.
I mean I'm fairly sure that's market manipulation, but it's only a crime if it can be traced back to me AND if crypto is considered an investment product, beholden to market manipulation laws.
I mean if I put a haunted plant on sale on ebay and pay a bit of money for the media to report on it, and some schmuck comes by to buy it for $10K instead of its real value of $10, does that make me guilty of market manipulation? I mean the answer is yes, but is there a punishment for that?
Imagine if suddenly someone found 100 000 metric tons of gold and wanted to sell fast. It would saturate the market and the price would plummet.
Same would happen if Satoshi wanted to quickly sell 50 billion of coins.