"No toilet"
The place has gone or never existed. A user of Organic Maps application has reported that the POI was visible on the map (see snapshot date below), but was not found on the ground.
OSM snapshot date: 2025-01-21T15:15:53Z
POI has no name
POI types: fee-no amenity-toilets
#organicmaps android

Is this road actually "Quinlan" Road? Needs survey, imagery, or data.sa.gov.au road names data to validate.

The (original) Cultana Training Area is here, it's not exactly clear from imagery exactly where it starts and ends.

See also https://www.energymining.sa.gov.au/industry/minerals-and-mining/communities-and-land-access/mineral-exploration-and-land-access/defence-land/cultana-training-area

Plaque for Old Bethel Bible Christian church and cemetery. No sign of them remains besides this plaque.

Significant solar deployment worth mapping

Roundabout being constructed here at the moment.

via StreetComplete 54.1

Unable to answer "What’s the name of this street?" – Minor/Unclassified Road – way/617314867 via StreetComplete 60.0:

Picnic Area/Stop

Atlan Stormwater | Complete Stormwater Systems Adelaide

Address: 9 Hampden Rd Mount Barker South Australia 5251
Phone: 1300 773 500
Website: https://atlanstormwater.com/au/

Welcome to Atlan Stormwater (formerly SPEL Stormwater), is Australia & New Zealand’s leading Stormwater specialists. Family owned and operated since 1972 Atlan Stormwater has been working closely with councils, engineers and contractors to build risk-free, clean water solutions for the future. Our products and services cater for every project, and our experienced team provides advice and support in sales, delivery, installation and maintenance of generational stormwater assets. Whether it’s ice cubes cooling your drink, building sandcastles at the beach or exploring the waterways and estuaries in your kayak, the joy we experience from clean water is precious – and it’s worth fighting for. Find the joy in water with Atlan Stormwater.

Two separate unisex toilets

via StreetComplete 60.1

Attached photo(s):
https://streetcomplete.app/p/258269.jpg

Playground and ball court

via StreetComplete 60.1

Attached photo(s):
https://streetcomplete.app/p/258270.jpg