Satoshi has a
balance of nearly 1 million BTC, let's guess what will happen if the wallet can be accessed by someone, whether it's the owner or maybe a hacker. Will the price of Bitcoin start to crumble and start not selling?
First of all no one knows how much bitcoin Satoshi really has, all these numbers are pure guesses that different people have made and are far off the mark.
Secondly if you read the links you can realize that it is not a single wallet or a single address (or even a handful of addresses) that contains that much which people could say "that is Satoshi's wallet". The 1 million balance is the total sum of tens of thousands of addresses that people guess belong to Satoshi containing block reward from early blocks.
Finally lots of coins from early days have already moved and are moving and will move in the future, none of them have ever affected bitcoin price apart from a handful of newbies panic selling.