The point is eventual possibility of an intelligence significantly stronger than that of current humans, with “humans growing up” a special case of that. The latter doesn’t resolve the problem, because “growing out of humans” doesn’t automatically preserve values, this is a problem that must be solved in any case where vanilla humans are left behind, no matter in what manner or how slowly that happens.
The point is eventual possibility of an intelligence significantly stronger than that of current humans, with “humans growing up” a special case of that. The latter doesn’t resolve the problem, because “growing out of humans” doesn’t automatically preserve values, this is a problem that must be solved in any case where vanilla humans are left behind, no matter in what manner or how slowly that happens.