No, If you were to discount 7/(1.15)^3 you get ~$4.60.Remember...

No,
If you were to discount 7/(1.15)^3 you get ~$4.60.
Remember we are 3 quarters into 2021, so its 3.25 years if you want to be precise on the timeframe.

Under my numbers (3 years & 10% discount), I get an implied IV of $5.12.

Also - why a 15% discount rate?

The risk free rate / Aus 10 year treasury yields are sub ~1.7%, meaning you are allowing for a ~13% risk premium.
I used a 10% discount rate, and I consider this rather conservative.

My valuation analysis goes a lot deeper than I've shared to date. I applied an 18 times p/e ratio for simplicities sake. I can share the whole report if needed.