They are neither saying that it is an analog device, nor that it has no A/D/A converter.

The statement says "Because there is no digital I/O" – this means that it has no AES, S/PDIF or other digital I/O. It is entirely possible to have a digital device with only analog I/O, as is the case here. You go in analog, through an A/D to digital, perform your digital processing, then send to a D/A, which produces an analog output.