Discussed this with a few friends also recently, even now during short seller week and future expiration - where billions of Bitcoins are sold to push the price

Discussed this with a few friends also recently, even now during short seller week and future expiration - where billions of Bitcoins are sold to push the price down the impact is about -10-20%. So $30 billion maybe make a maximum of 40-50% damage which isnt that unusual in its history. Also, unlikely that Satoshi would sell it all in one shot (or sell it at all) - she could just sell a billion a month and market wouldn't care.