LB you really do have your lawyer hat on a bit too tight sometimes. Have a reread of part g of the readback requirements. Then answer this question. Of all the information provided on the ATIS, which item is most likely to get you killed if you get it wrong? I'm not sure how you record your ATIS but if you write it down while bumping around in turbulence and distracted by other things then an incorrect QNH can be recorded. ATC are doing you a favour by confirming what QNH you have recorded regardless of the ATIS identifier. I would suggest that you don't fly in NZ because the readback of QNH requirements would make your head explode.