The above rates apply to working holiday maker income earned from 1 January 2017. Any income earned prior to 1 January 2017 will be taxed based on residency (most working holiday makers are foreign residents for tax purposes).
When you leave Australia and return to your home country, you can apply to have your super paid to you as a departing Australia superannuation payment (DASP). The tax on any DASP made to WHMs on or after 1 July 2017 is 65%