They ARE telling you what they actually receive for the gas,...

They ARE telling you what they actually receive for the gas, because they receive the ex-field price. That's different from what the buyers pay for the gas because the pipeline companies take the tariff amount.

The averaged delivered price is meaningless because it includes vastly different pipeline tariffs if they are delivering to a local NT customer, or through NGP to Mt Isa, or through NGP, GCP and WBP to Brisbane. The only way it would be meaningful is if they broke it down by contract, which they are unable to do as that is commercial-in-confidence. The buyers don't want alternate suppliers knowing what they pay.

The tariffs for the various pipelines are publicly available if you want to look them up yourself and construct the approximate portfolio delivered price. but like I said it's not much use to you.

They are publishing the ex-field price and you are complaining about not getting the delivered price. I get the feeling that if they published the delivered price, you would be complaining about that and accusing them of trying to hide the ex-field price.