Wobani and Ring of Kafene are Gilroys not in the Visual Dictionary and not covered in the slightest. Although The Ring of Kafene is covered in the art book and labelled as Planet X. So Planet X may have been originally in the script but not shot until much later and then given it’s Ring of Kafene trading post label as they had no name for it.
I find this part of Ronster’s argument compelling - it points to them being very last minute additions. Given how much we (don’t) see of them, seems possible.