Judging by his e-mail to D&C insisting the guy apologize unless he wants to get sued, but also forbidding the mention of the threat itself, this seems like an unfortunately likely scenario.
Sorry if thas had already been answered, but isn't this illegal or atleast shouldn't it be?
He's forcing someone to jump through his hoops and act against their own self-interest or else he is going to abuse the legal system and draw them into a long, expensive and unwarranted lolsuit.
Oh, and if you tell anyone you're fucked!
Sound like coercion to me...