Magna's group spent nine months traveling roughly around the same areas that the game is taking place in now and they said they encountered no one while they were out there. Yet here we seemingly have Clementine encountering new people and other groups to fight virtually every day. Not only is Lilly's group supposedly out there but they are in a 'supposed' war with other smaller scale communities as well. All in just the state of Virginia and season 4 is also supposed to take place a couple years into the future of where the comic presently is when the human population should 'technically' be even lower than it is as of issue 189 of the comic.