I agree it's bonkers that this is possible. I agree, in an environment where the SEC seems unable to stop him, Elon Musk might well consider 22% return worth doing. None of that is relevant to the point I'm making.

I'm contending the claim that the implicit (and completely pro forma!) threat in his SEC filing places "insane pressure" on the Twitter board. The the possibility of a 20+% stock price change will not play a large part in their calculations. It's just not a big deal in the context of such a volatile stock.