If I look at the previous year I had accumulated 180,000+ points through flying in the first 7 months of my membership year before I was grounded. I have no idea what period the 50,263 is from.
There are a few caveats to the Status Bonus which mean you may have only received 50k bonus points on top of 130k from flights.
The 100% status bonus for WP/P1s in premium cabins is based on the Flex Y earn rate rather than the premium cabin travelled. Status bonus is also not applied on the minimum 800 points guarantee on shorter routes. Some examples of how this actually plays out:
SYD-MEL in discount Y earns 800 points + 0 bonus (due to minimum points guarantee)
SYD-CNS in discount Y earns 800 points + 600 bonus (due to minimum points guarantee)
SYD-PER in discount Y earns 1450 points + 1450 bonus
SYD-MEL in J earns 1400 base + 600 bonus
SYD-CNS in J earns 2100 base + 1100 bonus
SYD-PER in J earns 3300 base + 2200 bonus
Basically, to earn the full 100% you need to be flying routes >1500mi in economy. If you are flying shorter routes <1500mi covered by the minimum points guarantee, or flying J/F, the bonus you receive will less than 100% (and in some cases 0%!)