Looks like Coles is trailing a subscription plan similar to Everyday Rewards Extra for Vic/TAS (edit 8/8/24: seems available Aus wide now) customers.
It appeared within the Coles app on my Mobile.
Enjoy 10% off one shop, every calendar month. Save up to $50 a shop.
Get double Flybuys points on every purchase at Coles, First Choice Liquor or Liquorland
- Pay $7 a month. Cancel any time.
I can't find it anywhere, even on their website. Coles are trialling the program, so it might be targeted?
ETA. OP updated the link. Works now!