No, that’s.
The SonoreUPnP represents as a Roon Endpoint to the Roon Core.
The NDS just gets a UPnP stream, pushed from Roon (as opposed to pull with UPnP).
You then control the playback from Roon.
This works better than converting to S/PDIF and uses the NDS as it was optimized for, as a Network player.
I run the SonoreUPnP bridge on a UltraRendu with a Uptone UltraCap LPS 1, with a dual faceplate making a neat single unit.
The easiest and best way of adding Roon for your NDS.
Simon