Uncertainty about what the regulations require and permit? Shirley you jest!
Perhaps “area” is intended to mean “airspace”? That way the RPL holder without recreational navigational endorsement will always be confined to out-and-back to the same place.
No doubt CASA will have a variety of clear answers as to:
(1) Whether an RPL holder without a recreational navigational endorsement is allowed to take off from an aerodrome and land at any other aerodrome or landing area within 25 nautical miles (assuming the other aerodrome or landing area is suitable for the landing and taking off of the aircraft being flown).
(2) Whether the “departure aerodrome” is always the same place.