Kudo for that crew!
I was number 2 in approach behind those guys. Here are the facts that you can verify by listening to the ATC tapes.
Winds were barely over 10 knots from the west, night time with a broken ceiling of around 1300 feet.
4 types of approach were available: RNAV 24 or vor-dme 24, rnav or ndb-dme 30 and ils 06.
According to the conversation, they were unable Rnav because their system was out of service.
Their plan was to go for ils 06 but they were concerned by the strenght of the wind (limitation of 10 knots tailwind)
Why not ils 06 then circling? I suppose it is forbidden by their ops manual.
They elected to shoot on 06 then ask for radar vector for 24 (good way to navigate trough the restriction of their ops manual!)
Now, why not vor-dme 24? That, I don't have an answer.
Good marks for those guys from me: they made it safely, they respected the regulations, they respected their ops manual, they respected their limits. I've seen too many pilots playing heroes with my family aboard.
Bad marks for CYQB International airports: an international airport without an ILS on the runway facing the predominant wind!!!