not be married, engaged to be married, or have a de facto partner; and must be:
1. under 18 years of age; or
2. over 18 years of age but not yet turned 23, and be dependent on you or your partner; or
3. over 23 years of age and be unable to earn a living to support themselves due to physical or cognitive limitations and be dependent on you or your partner (Note: The child will still need to meet Australia’s health requirement); or
4. a dependent child of a child who is eligible under 1, 2 or 3 above.
Your child or stepchild is considered to be dependent if they continue to be wholly or substantially reliant on you for their basic needs (food, clothing and shelter).
It certainly is, you will find it's the same with all legislation, they will have the original dates but will be modified - common practice.
Just be careful as some of what's in the legislation doesn't reflect "real world" for instance the maximum age of a 417 visa. It can be very much a scholars document at times. Immis website doesn't always match this document - plenty of mistakes on there to catch out the dabblers like us
That document is the spell it out in black and white.
Immigrations website is the Chinese whispers translation into layman terms to make it easier for the general public to understand what they probably may possibly occasionally need to do for the visa, it's useful but not as definintive as you would like!