Then, after they have been afflicted and driven—a separate affliction than being carried away captive from Jerusalem—Israel will learn the identity of their Redeemer and be returned to their homeland. The relevance for Jacob’s people is that the promise of return applies to their descendants, since they are heirs to that promise.
Perhaps, as new people in a new land, the genetic descendants of Lehi in the audience feel the pang of loss for that land and inheritance. Jacob reassures them that the prophets have promised their return. This consolation is emotional only, not practical, of course, since the future return cannot involve anyone actually present in the congregation. And their descendants would consider the New World, not the Old, to be their own homeland.