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I see you have been waiting so I will jump in.
Your question is best put to an accountant or the CRA rather than a lawyer. However, I am dealing with the tax treaty with OZ on the same issue.
It appears the treaty attempts to mirror each countries rules so there is few discrepancies. I believe as you do that these payments would not be taxed in Canada.
I would start with the Tax Rulings Directorate. Here is a link....
My read is as yours that it should not be taxed. But, only a ruling from the CRA will secure the issue.