ARGUEMENT 1:
I refer you to Appendix IX of CAO 20.18 as an example. It talks about Night VMC agriculatural operations requirements.
I'm not an ag-pilot, but I don't think you'll find many operators doing IFR night spraying ops, which indirectly implies (due to the lack of the term IFR) that Night VMC is not IFR at all.
It's ANY flight rule structure in VMC at Night... IFR or VFR.
ARGUEMENT 2:
CAR Definitions:
V.M.C. is the symbol used to denote meteorological conditions in which the flight visibility and distances from cloud during a flight are equal to, or greater than, the applicable distances determined by the Authority under subregulation 172(2).
The CAR 172 referring above is in CAR Volume 3, Division 3, VISUAL FLIGHT RULES. CAR 172 also specifically refers to the VMC requirements set out as per applicable to VFR flights.
As long as you conform to VMC, your requirements are as per appendix 4 and 5 of CAO 20.18