It’s illuminating to know  that there’s also a large  amount of...

It’s illuminating to know  that there’s also a large  amount of detailed work already done that hasn’t been announced. The extract here is from the activities report, and notes it.
It ( the PFS) may also be a summary ,so as to not give too much guidance to the neighbour...

’The  PFS report itself comprises 18 sections, each with an appendix, and contains intellectual property owned by AVL and sensitive information. The PFS was purposefully developed to the high standard required for rigorous external scrutiny by future Project investors and financiers. The announcement provided the market with a summary of the full PFS.’