I see you shifted it to the correct location. I fixed the syntax.

Hi, this appears to be in the wrong place as Ocean Street is across the highway to the se.
Also the syntax for addr:state should be NSW instead of New South Wales, but you don't need to add state or postcodes because these are already mapped as areas.

I have used your comment on the node referred to change the speed limit tags at that point. It is now 110kph on Woodie Woodie Road north of that node until the road name changes to Ripon Hills Road at the junction with Telfer Road. South of the node it is now 80kph and I extended this limit until it changes name to Woodie Woodie Access Road where it meets Skull Springs Road near the runway.
Can you confirm if this seems correct.
The speed seems too high in the north at the Woodie Woodie Road, Ripon Hills Road and Telfer Road junction area.

On another note are you able to confirm the Woodie Woodie Airport icon should be relocated to where the runway is. The airport name and icon seems to be within the mine at the moment.
osm.org/#map=15/-21.65329/121.20739

…typo….meant to say…
it is unclear to me…

Hi, this is clear to me. Have you split the road at that and other points as necessary and added 80kph speed tags to the relevant sections of the road and 110kph tags to the those sections?

I have reverted this changeset as the building exits on later imagery available in the editor and the building is included on the university web site.

Hi, I reverted this changeset because you connected a footway to a powerline.
You need to add the footway again by zooming in much closer so that you connect it only to the footway.

Hi, this building appears to exist on the latest imagery, Esri. Are you sure it needed to be deleted?

Hi, you deleted part of the boundary relations for Mount Druitt and
Rooty at the junction of Duke Street and
Woodstock Avenue.
Hill https://overpass-api.de/achavi/?changeset=159278194
I have fixed both relations.

Hi, unsure why this was a multipolygon.
https://tools.geofabrik.de/osmi/?view=areas&lon=115.81559&lat=-31.91664&zoom=19
It grouped two different addressed buildings together in a mp and was not constructed or tagged correctly so I deleted the mp.

Hi, multipolygons can't have duplicated sides like this
https://tools.geofabrik.de/osmi/?view=areas&lon=116.00706&lat=-31.98605&zoom=19
I have fixed

Hi, you created an invalid wood multipolgon. Outer rings cannot join each other. I changed it to a simple polygon for the whole area as there appeared to be no differentiating tags to keep as three sections. If you still want them as separate areas then use three simple polygons which can share sides.

Please read the osm difference between a hospital and a clinic
amenity=hospital
I have changed to a clinic

Multipolygons cannot have shared edges. fixed.

Multipolygons cannot have shared edges. fixed

Another alternative is to construct them as TheSwavu has done, making a mp of each part and reusing the common section in each mp.

Osmi detects these mapping errors
https://tools.geofabrik.de/osmi/?view=areas&lon=145.23220&lat=-37.79508&zoom=19&baselayer=Geofabrik%20Standard&overlays=duplicate_node%2Csingle_node_in_way%2Cduplicate_segment%2Cway_in_multiple_rings%2Cintersection%2Cintersecting_segments%2Cring_not_closed%2Ctouching_rings%2Crole_should_be_inner%2Crole_should_be_outer%2Cinner_with_same_tags%2Cways%2Cduplicate_node%2Csingle_node_in_way%2Cduplicate_segment%2Cway_in_multiple_rings%2Cintersection%2Cintersecting_segments%2Cring_not_closed%2Ctouching_rings%2Crole_should_be_inner%2Crole_should_be_outer%2Cinner_with_same_tags%2Cways

Hi, you are creating invalid multipolygon relations. Our wiki has extensive documentation on multipolygon validity.
Outer rings of mp cannot share sides.
You should just use simple polygons for these type of buildings or use the building:part method where you would draw a polygon around the outside perimeter and then draw the individual sections as building:parts. These are especially for representing buildings in 3 dimensions but can also be used for simpler mapping like this.

Name is not needed, addr:housenumber = 103 is sufficient

Hi, I reverted your changeset because it is probably easiest for you to add a new node within the building boundary and add all the business tags to that.