I doubt satoshi will do that because satoshi could have done something like that for years, you think he just realized he is rich ?

There are insane amount of things he can't do that for. First of all the price once hit $20k but lets take last year into account, back when price was $900 if he sold his coins he could have made 882 million dollars from 900 dolar price. Let alone $20k price, and certainly not today, which means if he wanted he could have made a lot of money however he knows that if he does that it gives both sense that even the owner of bitcoin is going away from bitcoin and also he would drop the price of bitcoin to dust all by himself.