No route lowest safe altitudes Australia

Good Evening,

All of the route lowest safe altitudes in Australia appear as “NESTB” on Navigraph. I understand that NESTB is used when there is no real world data available, however all Australian charts issued by Airservices Australia display a route lowest safe. Is it possible to get the lowest safes incorporated in navigraph charts for Australia?

As an example, route W675 between OTKED and COM, lowest safe is 6100ft: