They have to say nonsense like this, because any critical thinker would quickly reach the conclusion that a large percentage of the population have never been exposed to the message of the Watchtowel, either because they are young, or because they live in a country where dubs have no presence or simply because no dub has spoken to them.
However, how does that square with the notion that the people that die at Armageddon will be the ones who reject the message? So if I live in Saudi Arabia and never heard of Jdubs or their message, do I get spared? If the answer if yes, then how incredibly unfair that people who by sheer luck are born in countries where they don't preach, get a free pass at paradise, compared with those living in xian countries.