As the OP for this thread, I posting to report my recent departure experience at NRT.

I departed NRT on a mid morning *A flight on a weekday and can confirm that NH has special *A priority check in counters but there was NO priority security clearance for *A Gold member. In fact, I did not notice a priority lane as suggested in NH web site. There were a lot of departing passengers but the queue moved very quickly in typical Japanese efficiency.