Do you really think that Tariko did not know that the stock was going to get pounded into the ground after his letter was released? He knew the stock would go down, and he is using the position to strengthen his negotiation.
And your point is? Hows it working out for you
My point is that the letter was strategic, and he will get enough people to support him in his effort to gain control of the company. Once he gains control, I see upside value to this company.