first i've heard of it, but turns out it is a federal marine park area in commonwealth waters there (not state run by DBCA or fisheries) as per this 2018 plan
parksaustralia.gov.au/marine/pub/factsheets/factsheet-south-west-management-plan.pdfmost of the area shown is multi-use for recreational users, therefore very little impact
i haven't had a closer look at the green zone yet (though it is much smaller)