I believe the units may be wrong. The units should be ug/kg (micrograms/kilogram) and not mg/kg (milligrams/kilogram). What the FSANZ states is correct.
Here is a paper which has looked at the different concentrations of As in Australian and imported rice.
Here is some more information on As in rice -SBS website.
Also background/natural levels of As in soils are typically in the range of 0.2 to 30mg/kg. 189mg/kg would suggest that the rice was grown on highly contaminated soils, assuming that those levels would not cause the mortality of the rice plant. Mortality would likely occur where the form of arsenic is available to/could be taken up by the plants.
