Acontia marmoralis is not in the Australian Faunal Directory. With little research, it looks like marmoralis is derived from Phalaena marmoralis Fabricius, 1794, the type location of which is India. The BOLD images of Acontia marmoralis are all from northern areas of the NT and do not appear to match the Indian marmoralis and seam closer to Acontia elaeoa. Acontia marmoralis and Acontia elaeoa also show up under the genus Emmelia.
Acontia elaeoa is recognised by the AFD and looks simialar to this moth to me. See https://www.inaturalist.org/taxa/558168-Acontia-elaeoa. And its distribution on iNaturalist includes the Brisbane area.