I think this is how it works but correct me if this is not right
There are 2 key issues around player ‘retirement’ – do you still get paid, and if so, will it count against the salary cap.
First, in short, ‘no’. A player who decides to retire (stop playing) mid-contract forfeits entitlement to pay, and I think Kane Elgey is a recent example. No pay, and not in the cap. If you stop playing but are still technically available, even if unfit to play, you still get paid and it still counts on the cap.
The exception is the notorious ‘medical retirement’. Supposedly applies if, after signing your current contract, you suffer a career-ending injury. Snake and Matai were denied this, so even though they were broken, they were still paid and their pay was included in our cap. Controversially, and to the great advantage of perceived favoured clubs Eels, Broncos and Souths, players such as Watmough Gillett and Burgess were surprisingly granted medical retirement, despite well-documented injury histories. Hence still paid but not counted in the cap.
We’re told Greg Inglis was not medically retired. Yet his contract was not counted in Souths cap beyond 2019. That decision never passed the pub test (and with Gladys re-opening pubs, it still doesn’t).