Let him sell if he wants to sell. He's been doing that if I can remember, so why worry if he's about to sell a bunch of bitcoin?
But he is lying. How can he have that many bitcoin? I'm just worried people believe it and the price stays down. I have bought bitcoin because it is digital gold so I don't want the price going down.
Believe in the fundamentals of bitcoin. He can FUD all he wants, but the price will be strong. If he sells, then there is more opportunity for us to have bitcoin at a lower price. The price will recover from it.