That's only relevant when comparing states with low populations and states with high populations, which is related but not quite the same as biasing rural popul

That's only relevant when comparing states with low populations and states with high populations, which is related but not quite the same as biasing rural populations over urban populations. California has way more rural population than Vermont, but Vermont voters are vastly overrepresented in the Senate (and the electoral college). The bias towards urban populations would be more significant in congressional districts within a state, I reckon.