There are now two categories in the "reduced tier points" grouping. Taking domestic as an example:
Full fare, flexible or some semi flexible, earns 20 points, as does a domestic flight booked with a C/J or F/A connection
Cheaper inflexible fares (I have identified B, V and N but there may be others) earn 10 points
Very cheap inflexible fares (Q, O or G) earn 5 points
It's only after getting up the list of flights are you able to see the actual booking class offer, by clicking on the flight number.