That's not how it works, the board would look at the long term value of the company, not the current price or what it will be in the next few weeks if Elon sold.
For instance Twitter stock was $60 last october, if they didn't ask for at least that it would be shortchanging shareholders and also imply a declining company.
We will never see those prices again. They occurred during overvalued and speculative market conditions and we will not return to that for several years, if ever.
You don't need an implication of decline when the market has already explicitly indicated it believes Twitter is declining as evidenced by the falling stock price.
For instance Twitter stock was $60 last october, if they didn't ask for at least that it would be shortchanging shareholders and also imply a declining company.