Yes, it is one dimensional and far from a comprehensive review -...

Yes, it is one dimensional and far from a comprehensive review - pretty obviously. But I suspect its intention is clearly to give a perspective - a broad brushstroke view, at a quick glance, of the major (Aussie mainly) explorers/potential developers and their resource base. Grade, depth etc. etc are not shown, but you get a view of "size" ...and beyond that the reader can look into it further.
It's a useful basic tool in my book. I appreciate @Verily1  putting it up...