That is not true, no. That misconception may stem from the fact that the main Air Canada brand doesn't operate any Bombardier aircraft. However, Air Canada splits its operations between mainline service and regional service (under the Air Canada Express subsidiary). As Bombardier didn't build mainline aircraft until recently, Air Canada didn't have anything to buy. Meanwhile,  Air Canada Express operates 133 Bombardier CRJ regional jets and Q-400 turbo props.

Bombardier recently entered the mainline market, and subsequently Air Canada put in an order for $4 billion worth of CSeries jets.