The phrase in Colossians 1:23 does not have to mean that every single individual in the world heard the gospel.
(Vakolosa 1:23) Marito lawa a ma vuleke a ma fanelanga ma tekiwa hi ku kongoma, onge hiloko ma vula leswaku vanhu hinkwavo lava a va hanya hi nkarhi wolowo se a va ma twile mahungu lamanene.