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Ted's dad hadn't renounced his Cuban citizenship by the time Ted was born. Cuba definitely rescinded it's citizenship claim when dad became naturalized Canadian. No dual citizenship for Cuba, period. Also, no "no country" or "stateless" time either. One moment dad is Cuban, the next moment he is Canadian. When Ted was born, dad was Cuban.

Ted's citizenships are first assigned at birth, and that is the moment the constitution examines. There are various legal mechanisms to alter his citizenships as he ages.

Interestingly, that dad was pursuing and obtained Canadian citizenship strengthens Canada's claim on Ted at birth and as he ages. Residence and domicile (the place you call home and always return to) are fundamental to citizenship inquiry.