Not sure if the defender hit the receiver in the head, or just blasted him between the shoulder blades, snapping the head back. So:
High hit on a defenseless receiver? Maybe, hard to tell.
Regardless, if you consider the receiver on or behind the line (and I don't), then it can't be DPI. But if you consider him behind the line, it's both DPI and Ineligible Downfield, so the fouls will offset.
Replay the down.