The instrument repeals the instrument Migration (IMMI 18/030: Class of Persons and Specified Events for Class GG Visa and Subclass 408 (Temporary Activity) Visa) Instrument 2018 in accordance with subsection 33(3) of the Acts Interpretation Act 1901 (Interpretation Act). 

The Interpretation Act states where an Act confers a power to make, grant or issue any instrument of a legislative or administrative character, the power shall be construed as including a power exercisable in the like manner and subject to the like conditions (if any) to repeal, rescind, revoke, amend, or vary any such instrument.

 Source: Migration-LIN-18-215-Class-of-Persons-eligible-for-a-nil-visa-application-charge-for-Class-GG-visa-and-Suclasss-408-Instrument-2018.pdf

and 

LIN-18-215-Explanatory-Statement.pdf