Neither man nor woman: High Court ruling 'sex not specified' / 'neuter' and impact on visa applications

Sex not Specified....Will this be the new tick box on application forms at the DIBP, MRT-RRT, AAT and other institutions requiring a person to name their what they are, including 'neuter'?
How is this going to impact on a partner visa application? If the person doesn't need to identify if they are male or female and two neuters 'sex not specified' get married or claim a de facto relationship then what? How will the DIBP assess that?
I'm thinking that the DIBP no longer have a right to force a visa applicant to declare whether they are male or female for the purpose of a partner visa application if the applicant would prefer to be known as a neuter or sex not specified.
This landmark decision has been handed down and reported in the Sydney Morning Herald:
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