They specifically call it a "streaming DAC" so seemingly not intended to be used as a transport with separate outboard DAC.
McIntosh doesn't seem to like the idea of a pure digital streaming transport for whatever reason. Off the top of my head I can think of their old MS300 music server, the MB50 streaming player, the MB100 media bridge, and the more recent MS500 streamer, and if I recall correctly they all have onboard DAC with analog outputs. A few of them may offer digital outs but the focus really seems to be on using them as a streaming DAC with the option of also using their digital inputs with an external CD transport. I don't know why McIntosh is against doing a pure streaming transport but that really does seem to be the case.