The definitive word from AC:
"Super Elite 100K members are given the opportunity to select a gift when accumulating specific amounts of Qualifying Miles. Threshold Gifts offered by Air Canada are limited in number and awarded on a first-come, first-served basis while quantities last. Regrettably, your preferred gift option may no longer be available. Thus, we invite you to make a different selection.
Thank you for your understanding and cooperation."
Ugggh!!!