To my knowledge, Native DSD processing is not the same thing as Native DSD (instead of DoP) - someone correct me if I’m wrong. (If I’m right, I’d suggest Roon Labs to rename Native DSD processing to something else. Not that they picked the wrong name, just that the name Native has already been taken to refer to something different.)
On Linux (that includes ROCK), many USB DAC cannot reach the full DSD rate due to the Linux architecture: