It's a Canadian thing and it's in the 2009 code as Appendix I, Rule 26-724(a). This seems to contradict the wording of the actual rule, but there it is, 'no' means 'yes'.
Unless the actual CEC differs from the Ontario version, I don't see any contradictions. It states quite clearly that all outdoor receptacles have to be on a circuit (or circuits) dedicated for outdoor receptacles.
