Good advice:
Ailerons neutral and unstall the wing (reduce the AoA by pushing the stick forward). Stalling is ONLY an angle of attack phenomena and can occur at any airspeed or attitude.
Add power as required - maximum may be needed
Then apply sufficient rudder only to stop further turning (AFTER the wing is unstalled)
Applying rudder too early (when at least one wing is stalled) creates a yaw moment that can make the situation far worse.
Unfortunately, I suspect the outcome of the Swan river event may not have been different even if this technique was followed, due to the low entry altitude.