I think I get it. My misunderstanding steamed from being concerned about the outside walkway not looking like it was inside/part of the building. In that scenario, it should be classified as building=roof like you said.

I've corrected it, hopefully right this time. I'll have to go back and correct a number of my past edits too.
changeset/183305202

Thanks for picking that up. I didn't even notice that the areas had turned into a multiplogyon, it was probably because I merged the separate areas.

I've deleted and redrawn it as a single area which hopefully resolves the issue.
changeset/183295108#map=19/-38.022175/145.304732

The whole purpose is just so I can include a path to the but also indicate that it is below a roof overhang/cover from the building.