They will be lucky to survive until the two year anniversary of...

They will be lucky to survive until the two year anniversary of SO4's demise imo.

Read the update. They highlight the problems with mechanical harvesting, they tell you that flotation of schoenite is still a problem, they tell you that schoenite conversion is a problem. And they basically admit the plant doesn't operate well in the Pilbara heat.
Current annualised production is less than 1/10th of feasibility after 18 months of trial and error and tens of millions of dollars spent.

You have to be very optimistic to see this becoming profitable.