I called Datasat today and talked to them about the USB port. Turns out it isn’t active. It was added to the LS-10 but never activated for USB Audio. I asked Sinjay if I would see any improvement adding a bridge so I could use the SPDIF Coax connection and he said there is no improvement over the HDMI using the Roon. That they have tested that and there was no sonic improvements.
I’m glad they called me back as I was ready to buy the Bricasti M5 today!