Ann: Pilbara Progresses DSO and Updates Capital Forecasts, page-33

It never ceases to amaze me how many "experts" we have on HC. If you read the announcement in its entirety you MAY understand the logic behind the Capex now, rather than down the track (perhaps when the roads deteriorate to an extend where they cannot move any product).
In particular, the following points are relevant:-
Additional capital investment is expected to be funded from existing sources including project contingency, management reserve, previously raised equity capital, along with DSO product sales and product pre-payments.
There is also a reference to increased trucking payloads.
Also check out the current price of lithium and China's product shortage.
If DSO sales and product prepayments now can fund Capex, it makes sense as the long term benefits are enormous.