They do this so Zionist propagandists like you can turn around and say: "See, there's really no genocide or forced displacement occurring here! They printed leaflets... in Arabic!"
Arabic leaflets do not disprove genocidal intent. They merely provide an excuse for people like you to give cover to the genocide in progress.
Regardless of whether or not the people evacuate, the end result is the same: Increasing the destruction and adding to the degree in which the region is inhabitable, so that it can be re-colonized by fanatical Jewish religious extremist settlers in their crazed desire for a 'greater Israel'.