According to the article, there is a defence invoking that exact sentiment if a merger is about to be blocked, bu iRobot decided not to invoke it (likely because it would have caused the price to be lower).
Why the price would be lower? Presumably the price was already agreed upon. Having a provision in the contract that the price is reduced if this argument is made to the antitrust authorities makes no sense.
I now realized that I recently saw some old tweets from this guy where he first opposed this merger and then celebrated the cancellation of the deal. So it seems he's just grasping at straws to look less like an idiot.