He can also raise money from other investors in the private market.

There have been indications that Tesla may announce a stock buy back. Several large investor in Tesla have been making the case for it. S&P just upgraded their credit rating. If Elon did need to sell more that would mitigate any negative effects.

Long term none of this Twitter drama matters. The PE of Tesla is incredibly low right now and the company is super healthy with no real signs of slowing down.