Why an alternate Canada might reject a ship offer

Why might the Royal Canadian Navy reject the ship proposal mentioned in the Canadian Power alternate history?

A preference for domestic construction or the politics of the supplier could explain it, but the answer does not establish the scenario author's reason.

An attractive foreign ship can still lose out to domestic construction priorities or political objections to its supplier. Those are offered as possible explanations for the rejection in the Canadian Power timeline. The scenario has its own earlier departures from real history, so its procurement decision depends on those assumptions. No specific cause is confirmed, and the answer defers to the reasoning given in that alternate history.