The dude is in net profit from trading, he only used a much higher leverage on that trade and somewhat got liquidated.
A rich person like him suppose not use leverage at all which is the reason he lost so much. Using millions to trade can give high ROI without using leverage but I do not know the reason he is using high leverage to trade which is just greediness and he got liquidated. If he is not careful, he may later go broke or he should just change.
The only reason why I think he did this is maybe he thinks that he knows the game, i.e. ego and that he will always be winning in his trading, which is not the case. Every one of us have lost a lot of money in trading.
That's why I believed that trading is not for everyone, just like gambling. And this is the very definition of why we compared gambling to trading. They said we have a fall back or mitigate trading. But in this case it's totally different. The guy seems to be addicted and then wanted to get that adrenaline rush with trading.