What I suspect happened, and this is purely speculation, is that...

What I suspect happened, and this is purely speculation, is that Mitsui, POSCO or Bahrain steel have agreed to a JV BUT conditional on 20TPA so management abandoned the PFS findings of using existing infrastructure for 10MTPA, and entered into an agreement with Flinders Port to build a new port at Myponie which is also conditional on 20MTPA but now that the data have determined 20MTPA to be uneconomical both the JV and Flinders provisional agreements are in jeopardy of collapsing so the "strategic review" is a last ditch effort to salvage these agreements which are all dependent on 20MTPA (or ramping up to 20TPM) which is why they need a slurry pipeline and a new port and cannot revert to 10MTPA using existing infrastructure....