Yeah... what I meant was that you can build 20% more facilities, so you can make 20% more stuff.
But, the increased population Doesn't equate to increased production rates except on Huge breatheable planets, becase only there does the increase actually take the max population to a new pop modifier. But, it does allow you to load population off of your HW without lowering it below 2000, 3000 or 4000 (depending on size), and so lets you more quickly build up new colonies, while maintaining the high bonus on the HW.