That's not an ecumenopolis. That's a habitat.
While you can find trade value in space in the Le Guin update, the true source of commercial wealthy is planets - especially heavily urbanized ones. As for what trade value does exactly... that you will find out in tomorrow's dev diary.
Edit: Wait, I went and checked and habitats are smaller than that now. My bad.
Edit #2: Actually, I think I see how Ecums work now. They're planets that use the habitat districts. Looks like Housing, Leisure, Trade, and Research from left to right. Given that these districts make habitats worth it despite having only 6 size...Damn.
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