Have a read of CAO 82 Appendix 5, 7 Table 1 to see how the multiple (separate) runways for a diversion is considered to be of lower risk than a single runway.
Even if YSNF had parallel runways and ILS, it should have an alternate though. Out of interest, what other countries in the world permit operations to aerodromes with no alternates (without even getting into the issue of Island aerodromes).