So the latest update of BR frequency to Canada is reflected on AeroRoutes:
Taipei Taoyuan – Vancouver eff 19SEP22 Increase from 5 to 7 weekly, 787-9/-10 (schedule below effective 01OCT22)
BR010 TPE2355 – 1925YVR 781 246
BR010 TPE2355 – 1925YVR 789 x246
BR009 YVR0200 – 0520+1TPE 781 357
BR009 YVR0200 – 0520+1TPE 789 x357
https://www.aeroroutes.com/eng/220823-brsep22ca
All 7 weekly flights will be switch to 787-10 by the start of winter schedule.
So by Jan 2, 2023, BR will restore capacity to Canada to pretty much pre-pandemic level. So the question is, are there any further demand for traffic between Taiwan and Canada? If there is, then they'll need AC's help because BR already sending their biggest plane to both YVR and YYZ for all 14x weekly flights.