The ATSB report of the Gippsland tragedy says:
A review of the pilot’s examination history revealed several errors about aerodynamic stalling in exams conducted during 2024 and it was concluded that the pilot likely had inadequate knowledge of the relationship between angle of bank, load factor and stall speed. Additionally, the investigation found several instances of irregular practices in training and exams at the Adventure Flight Training (AFT) school, which included the pilot’s exams, and concluded that those management practices likely contributed to the pilot’s inadequate knowledge.
If a training, testing and flight review system cannot detect and correct, or weed out, pilots who have "inadequate knowledge of the relationship between angle of bank, load factor and stall speed", it's a sham.