It’s a stock market scam. Elon used to do this all the time with his companies until he got investigated for it. You move the headlines to change stock prices, then pull back later.
You know when your stock price is going down based on headlines and when it will go back up based on insider knowledge of reversals of previous positions and can buy/sell accordingly.
That strategy now has the White House behind it. Pump and dump tariff announcements are a feature, not a bug.