I've been browsing for the last couple months and I usually never see that specific route option available as a married segment. I remember seeing it last year, but you can easily find that segment on krisflyer. Even on Krisflyer I found it not to be worth it since the segment cost 30 percent more. I'm assuming you want to try the J class on the 777 and/or do a stopover in JPN for a few days
Yes, trying to do a stopover, and want to see if I can do it via Aeroplan instead of paying the Advantage rates on Krisflyer.