Australia- Active Cases Drop by 15,000 in One Day!!

In this video I take a deep dive into the COVID-19 data from 15/03/2020- 10/09/21. Looking specifically at the hospitalisation / ICU rates and recoveries and the anomaly of 15,000 Active Cases that disappear on the 10/09/2021. In the middle of a lockdown, in Sydney Australia, with 1000+ people in hospital is there a logical explanation? Does this mean there have been thousands of false positive PCR tests? Have the case numbers been falsely inflated to encourage vaccination?