The answer is "sort of". The Amber was originally a USB only design. That is what the prefab pcb supported and where we saw the demand at the price point, but it seems many really did want SPDIF so the pcb was modified by the ever talented Lukasz Fikus to accept SPDIF/Toslink. Its still a usb dac at heart, but those wanting to use spidf only can connect it once, select spdif and disconnect it forever using their desire spidif. Those wanting to use both have no issue regarding its default.
The explanation sounds quirkier than it is and the sound makes the day 1 setup MORE than worth it.