It will depend.

Is Solution Nine located on Etheirys? They jumped the shark. No way that had been sitting on Etheirys without word spreading.

Is it located on one of the Reflections? Then no.

Emet did tell us that some of the civilizations on the remaining shards might surprise us. We've been to the First and the Thirteenth. We have yet to see the Fourth, Eighth, Ninth and Eleventh.

Considering the architecture is reminiscent of Allagan and Garlemald, it seems likely that it would be another civilization Emet had his fingers in.