Obviously, Zio's appearance is quite comparable to Trent Reznor in his 1988-2005 appearance.
But coincidence or not, it is even a possibility that the allusion is there in his character art, and not just his face.
If you seen the art, on page 62 of the PS Compendium, Zio has a black, corrupted arm and hand, that has a claw-like appearance, coming to a sharp point for each digit.
Now what do claws have? Nails.
And on page 62, they are elongated on Zio.
Not quite Nine Inch Nails, but long enough to make you wonder if this was a sly reference.