I havent seen this dyno on this board, but if they did a cert run, it looks for >1.0% distortion . Meaning, the dd1 software worked. Again, i havent seen this dyno test on this board.
If they did a un cert run, it looks for clipping. Meaning again, the dd1 software did its job.
IMHO, ...Your "people" you are "speaking with", are doing it wrong.