Your protection if the loan passes the home’s value
The lender can recover no more than the home’s value — its sale price, or an accredited valuer’s figure — and once it receives that amount your debt is discharged, it must not ask you or your estate for the rest, and it must pay you any excess (National Credit Code ss 86A–86D; Regulations reg 84A). This does not apply if you committed fraud or made a misrepresentation about the loan (s 86E).
What it does not protect is your equity: once the lines cross, what you or your estate get from the home is $0.
Before you sign, a lender or broker must show you projections made on the website ASIC approves (National Consumer Credit Protection Act s 133DB). This widget is not that projection.