To avoid unnecessarily panicking some people, when quoting the 183 day rule you should always add the rider that this is just the first test in determining Australian tax residency. If you satisfy further tests such as ownership of assets and social ties in Australia, you may still be a resident for tax purposes.
The 183 day rule is still only an initial test even under the proposed new legislation, which may state that if you're not in Australia for at least 45 days, you're no longer a tax resident, with no further tests possible. In fact, on June 14 last year, you yourself posted a useful summary from a law firm of the proposed new legislation - "If you are inside Australia for more than 45 days, but less than 183 days, there are some secondary tests that are not too difficult to meet, but some may have some difficultly meeting them. Also, Labor has hinted at changing the 45 days to possibly 60, maybe 90".
I'm well aware that the above is of little comfort to those who have cut all ties to Australia, maybe or maybe not most on this forum.
With regards to reporting of assets to Centrelink, I report mine every 2 weeks, on the day my superannuation pension's credited to my bank account, and would panic if I forgot to include a small reinvested dividend. I'm reassured by the more lackadaisical approach of some posters!