No, the price of LNG is linked to Brent (or at least some probably to JCC pricing).The LNG link I gave will be a close enough mirror to pricing of LNG for most Australian listed producers.
For WPL the price of gas from Pluto is more closely linked and NWS slightly less so as I believe the S curve has more of a wiggle in it. HT will know better that I but at least that is how the pricing seems to go.