Clearly, there is some sort of issue in how the 100 Bq/g and 1 Bq/g figures have been interpreted and compared. However, the situation isn't even as simple as making a comparison between the old level and the new level. In general, the BSS offers a range of different exempt levels depending on the radionuclide involved. A specific activity of 1 Bq/g is only relevant to materials containing uranium and thorium. As the review paper correct notes, this is going to involve NORM bearing materials. Mostly ores or ore concentrates either being mined or processed. The NSW legislation does not apply the 100 Bq/g ecut off for these materials. Instead, it applies concentrations of 200 ppm and 500 ppm for uranium and thorium respectively. These levels are approximately equivalent to 35 Bq/g total activity. Moving to a concentration of 1 Bq/g for the parent radionuclide is not as great a reduction as that suggested by the review paper. Another question that needs to be asked is whether NSW intends to remove the exclusion of the NSW Act from applying to a radioactive ore while it is being mined or is subject of treatment (section 5). While this exclusion remains there will be no issues under the NSW legislation regarding application of the 1 Bq/g to NORM materials.

I had a read of the relevant section of the document and page 34 certainly makes reference to the point you are making Nick.

...There is some indication that the next published version of the National Directory may regulate radionuclides to the activity concentration level of 1 Bq/g; this is in contrast with the 100 Bq/g of the NSW Regulation.

The error you point out is common place in WA too. Under the WA Mines Safety and Inspect Regulations we often use the BSS-115  1 Bq/g level for waste containing Uranium and Thorium (nat) as the determination point of radioactivity (not including daughters). Under the WA Radiation Safety (General) Regulations the radioactivity determining point is 30 Bq/g but this also includes all daughters. It is not uncommon for radiation professionals in WA to get confused by this subtle difference unless they  are made aware of it.