Chuck, i'm with you!!! I fail to see how an approach can be considered unsafe (or whatever they reckon it is) just because the aerodrome at the end of it is not certified or registered.
Sounds like someone at AsA or CASA is conducting a butt covering exercise .... Worried about legal action or copping it in the chops during an accident investigation should someone conduct the approach and prang at the end of it.
Without looking into the rules ..... where does that leave the likes of the RFDS or some other operators who may have specific approaches (RNAV) made up for their own use into some uncertified aerodromes.