Think about the events that happen when conducting an approach to minimums with the intention of going around if you are not visual at the DH. Would any of you just prior to DH reduce the power to idle whilst not visual or would you maintain a stable approach with stable power and speed until either visual or going around? I assume there was not much wind or a need to change power setting much due to the conditions in the final stages of the approach.
Having flown turboprops with splits in the power application I can tell you it is only really an issue when advancing from idle or near to it. If they were not land minded they would not have had the power at idle and going around at DH would not have caused a roll.