I believe it has something to do with the bundled RWPS file which would explain the connection between the two Irivers which can use the same remotes. It explains why those themes don't show up on the other 220x176x16 or 160x128 target theme pages.
This topic was mentioned two, three times in IRC already, unfortunately no-one with the knowledge could fix it yet or didn't find the time to. The code the site uses is in SVN so...