Of course it's viable at the $70-$90USD/t price. What was our...

Of course it's viable at the $70-$90USD/t price. What was our breakeven cost from the PFS, like $40-50? And with the expansion up to 10Mtpa currently being studied in the DFS, expect the breakeven cost to drop even further. So that's plenty of margin for profit, even after accounting for all of the super conservative "worst case scenario" financials presented in the studies. Especially when the exchange rate is as it is right now. Plus, the major reason the IO price is relatively lower right now is because of China's persistence on trying to achieve zero covid, meaning less demand, meaning oversupply. If they're truly about to start opening up again shortly, then expect the IO price to rise in the short-term.
All of this is without even taking into account the continually increasing premium that 65% Fe attracts over 62%, and 68% attracts over 65%, etc. etc.