Referring to this deal: https://www.ozbargain.com.au/node/522530 ( March 2020 )
It is no longer showing up in my purchase history. Was not able to update game so I assumed uninstalling and reinstalling it would 'fix' it, but I was then prompted to pay $7.49 to redownload.
It's strange because all of my other $0.00 apps are still showing up in my purchase history.
A bit concerning if Google / Ninja Kiwi can just revoke access to a game at will.