实践上中介说得可能没错,但理论上任何change of circumstance 都应该申报!有专用form的。中介当然懒得花时间帮你弄。
Section 104 of the Migration Act 1958 (the Act) requires you to
inform the Department of Immigration and Citizenship (the
department) of any changes in your circumstances that affect
any answer to a question in your application form.
You do not have to notify the department of any changes in
your circumstances that occurred:
• after you were granted your visa (if you applied for your visa
in Australia); or
• after you have been immigration cleared (if you applied for
your visa outside Australia)