Turkeyslapper, in answer to your question it probably depends upon the specific CASA approval the operator has.
To fly A to B at night below LSALT you must have an exemption, be it using Nitesun or NVG.
The exemption I am familiar with stipulates that when below LSALT on NVG you must be Night VFR. To me it makes sense, if you are visual at night (which you must be to be on goggles), then apply visual flight rules.