What I see here is not an organ that is designed as Rodgers and others have done in the past, a less-expensive alternative to the main line of instruments, using a modified or simpler tonal generation design.
I think, and this is totally conjecture on my part, that Roland has designed a new system that can be expanded into larger instruments giving easier access to the stops inside the organ - meaning, that this organ could appear as a four manual with many of the stops stored in the library. On a simple scale the organ may play through two channels of internal or external speakers. Adding external amplifiers and channels, the sound of the stops may be spread over a larger area, further improving the sound of the instrument.
This organ seems to be The Little Engine That Could, a basic instrument that could blossom into a much larger one. Just like a pipe organ, the more stops the richer the sound of the ensemble. Here we have a tiny organ that, due to the storage of many pipe organ samples in the organ, with some collected into groups that only take up one slot to play, the sound of a much larger instrument can be heard.
So when registering this organ, you can simply use the stops whose names appear on the stop tabs, but with experimentation using the voice palette stops behind them and the two USER stops to load more samples, you have a huge palette of tone colors to choose from.