Datapoint Australian English/Relativizer that or what in non-restrictive contexts

Variety: Australian English
Feature: Relativizer that or what in non-restrictive contexts
Value: B - feature is neither pervasive nor extremely rare
Informants: Peter Collins and Pam Peters

Examples

Example 3665:
In doing this I shall show that Australia has acted in a way forced upon her self by her geo-political position, that has attempted to ensure regional and therefore Australia's own security.

Source: Peters nd: W1A-006:41