It’s a “return fire” shot to the WestJet blanket status matching offers over the past couple of years. You need to have some sort of WS (or non *A) status to register for the challenge, and only WS Platinums can register for the 10 AQS challenge to reach E50K.
https://princeoftravel.com/blog/stat...anada-altitude
I can’t see there being a very significant population of WS Plats that don’t have AC status already...