So, this new world called Factorio1 has risen up to 2b GDP. As the man behind Terra Divitiae, it is simply impossible to reach 2b GDP with only 6k people. So, I believe that this is yet another modded world that slipped through the cracks.
Terra Divitiae is the legit one. If you are familiar with the MC2 trade, you will know how it reached there.
The Spice must flow.