The rumours have been floating around for over 2-3 months. If he was to really dump and run away, he could have done that during the market peak in December last year. Also, whales might be greedy, they won't be dumping for some cheap price considering the price would tank when the order book fills at least half... If the so called 1 million coins were true, and even before he sells, he should move his coins to any exchange wallet. That would create panic among the investors and would drop the price to at least $4000. A month back a particular whale wallet consisting of 23000 bitcoins were moved to another wallet, that resulted in a drop of few hundred dollars within hours.

Claiming himself as satoshi doesn't mean that he is satoshi. He hasn't proved cryptographically that he is satoshi by signing up the messages with the private keys. Hence, he is lying again and would lie forever.