Velocity rewards in Air Canada Premium Economy?

[Mattg]

I noticed that the Velocity website states that Premium Economy reward seats are available to book on Air Canada:

3. Premium Economy is not available on Virgin Australia Domestic and International Short-Haul flights. Premium Economy is available on Virgin Atlantic, Singapore Airlines, and Air Canada.

However, I have never actually seen one available. Even when Premium Economy awards are available to book through Aeroplan at the lowest points level, Velocity (and all other Air Canada partner airlines) just don't appear to have access to them. Am I missing something?