I finally figured out what the heck the meters on the front panel of the Xilica unit are indicating. They are calibrated as minus dB from 0dBFS. And 0dBFS for them is +20 dBu. I could not find this anywhere in their documentation. The meters in the XConsole GUI are clearly labeled as reading in dBu.
And BTW Kent is no longer with Xilica. I hope it has nothing to do with the info he provided me.