I think the threat is that he dumps his entire position and craters the stock price.
[1] https://www.cnbc.com/2022/04/04/twitter-shares-soar-more-tha...
My intuition is that his plan is genuine. He is buying Twitter’s audience, not Twitter’s product.
It would make perfect sense to just sell and go for plan B (buy through multiple people/off-shores or something).