The Workplace Relations Amendment (Termination of Employment) Act 2001 was an amending Act. Its purpose was to change parts of the Workplace Relations Act 1996 dealing with termination of employment and related procedures.
That distinction matters. This page is about a historical set of amendments to the Workplace Relations Act 1996, not the later Fair Work Act 2009. If you are dealing with a current dismissal issue, you should not assume the same rules still apply in the same form.
The Act received Royal Assent on 22 August 2001. Its commencement was staged. Sections 1 to 3 commenced on Royal Assent, while the remaining provisions were to commence by Proclamation or, if not proclaimed within 6 months, on the first day after that 6 month period. The compilation also shows a special commencement rule for item 3.