Although I haven't been on the Noordam in several years, I have been on late fixed dining on many other ships in that time. I know that late fixed was never at 8:30, except for a brief period many years ago (as in 20, or so, years), when it went to four fixed seatings.
Since that short experiment HAL has gone to a mix of fixed and open seating, at earlier and earlier hours. Last I knew, late seating was at 7:30 pretty much across the fleet, while early seating moved, in increments, from 6:00 PM to 5:30 (I think sometimes even earlier).