If by Early brine you mean the premium brine from the Williamson...

If by Early brine you mean the premium brine from the Williamson Pit then that was pretty much wasted creating floors to the development ponds on train 1.
They harvested the same ponds twice but the first harvest was from brine that had been precipitating for 18mths the 2nd harvest had only been precipitating for 4-6moths tops I would say and assume it is a mixture of trench and bore brine with probably some rain dilution and then there is the moisture content of the harvest salts to watch.
The fact that there was no information ( photos / drones shots ) about how train 2 was going, what appears to be extra baffles in train 1 and reusing the same harvest ponds so quickly would say to me that he and the others where well aware of it back in Oct / Nov 2020 but presumably thought they could bluff it through by producing some SOP which has obviously failed.
IMHO