Nice research.
So, if it's Ironscraper, they have marked it as a Cellar Release and bumped the "old" price by $6 since they last offered it at $39.99 as a non-secret wine 3 months ago, and got the a/v% wrong.
The deep discount would fit Ironscraper better than TF, they have the 2016 Ironscraper @ $35->$12.90
https://www.danmurphys.com.au/product/DM_MYSTERY79/secret-selection-barossa-valley-shiraz-2016
Sam Kim note:
Hare's Chase
'Ironscraper' Shiraz 2016
Rating: 96
This is gloriously expressed on the nose showing blackberry, blackcurrant, chocolate tart, leather, cake spice and vanilla notes. The palate is superbly concentrated and richly fruited, delivering outstanding depth and intensity, wonderfully enhanced by velvety texture and supple tannins. Bold and sturdy, yet silky and flowing. At its best: 2019 to 2028. AU$35.00. June 2018.
There are a few 6-packs of the 2016 on Langtons, with a low reserve price
HARES CHASE Ironscraper Shiraz, Barossa Valley 2016 | Langton's Fine Wines