No.
Multipolygon relation outer ways cannot share the same segments. 

If they are 2 seperate buildings then they's usuall have 2 addresses e.g. 8a and 8b. However as they both have the same name (Duetto) I'd take them as the same building .. just with one section having a different height - see building:part for information. 

I leave you to fix this.. see https://tools.geofabrik.de/osmi/?view=areas&lon=151.24103&lat=-33.87661&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