The LogNormal isn't a solution to GBM. It's close--close enough that people say it a lot--but it's not an exact solution. Apply Fokker-Plank to the GBM SDE to get a PDE, and plug in the LogNormal, and you'll find it doesn't actually solve the PDE.
The way I understand it, he has been making a killing in this market. He knows how to take advantage of crashing markets and wide spreads, unlike $HOOD and $COIN