catseye,
The locations you mention have procedures that are for specialised helicopter operations and the procedures are marked "CASA APPROVED OPERATORS ONLY". They are all considered point in space procedures (regardless of whether helipad or landing ground). The approval process places certain requirements on the operator for the use of the procedures.
Lets compare apples with apples. For a fixed wing, LNAV procedure, the aerodrome must be certified or registered.
Wolgan Valley meets the criteria for helipad registration and is operating on an exemption. (Currently there is no allowance for helipad registration under CASR 139. This is coming) Therefore the procedure has no restrictions placed on it.
Alpha