As per the Canada Revenue Agency "You become a deemed non-resident of Canada when your ties with the other country become such that, under the tax treaty with which Canada has with the other country, you would be considered a resident of that other country and not Canada.
As a deemed non-resident of Canada, the same rules apply to you as a" Non-residents of Canada - Canada.ca
As for the second half of your question, I will advise that you contact the Canada Revenue Agency (CRA) for further guidance at the Individual tax enquiries line
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