I skim read the Wikipedia article. I give you credit for at least the mentioning the controversy around the origin of the Gwion Gwion rock paintings - the people depicted, and their attire, do not look Aboriginal. Combined with the fact such realistic depictions of the human form are otherwise basically unheard of in pre-colonial Australian art, its origin IS unclear. Half the article is about the uncertain origins, and it's there for anyone to see the evidence in greater depth, unless Mr Focus goes in and wrecks it lol.
If anyone bothered to read the research?
Grahame Walsh ran the theory that Gwion Gwion art wasn't Aboriginal in line with early explorers, colonist's and squatters (pastoralists)
Reasons for this logic (other than racism)
Often some local Aboriginal's didn't relate to the art and reports of some Aboriginal's calling it rubbish, some research disputes the translation. However some local oral history relates the art to the Gwion Gwion bird who created to art by drawing the images from its bleeding beak. Remembering the art is dated out to 17,000 years every chance some thing got lost along the way.
Gwion Gwion art seems to have appeared out of no where.
It simply didn't at the time before the current art was drawn (last ice age) sea levels would have been lower and the progression to todays images will be under water. Some of the best galleries are coastal.
Time lines dated when Grahame Walsh was alive appeared to show a gap between the ending of Gwion Gwion art and the start of Wandjina rock art @4,000 years. Wandjina rock art is part of local Kimberleys current population oral history.
Its now been established through more advanced dating technics the two art style over lap in time lines.
As to the images dress, clothing, bags, tassels and hair styles not being Aboriginal early photos of Aboriginal show all of this. In the Kimberly the hair styles were common, clothing, bags, tassels were used through out central Australia also common.
Medical practitioner Dr David M Welch has published a series re Australian Aboriginal Culture, the "Aboriginal Paintings of the Kimberly Region Wester Australia" shows photos clearly demonstrating that there is in fact a direct connection to the figures in the art.
Its unusual the earlier proponent's of it being non Aboriginal didn't also make the connection.
Wandjina rock art below I think this is the gallery at Elisabeth Station on the Gib River Road note there are no mouths, the Wandjina rock art is often touched up as a part of tradition some galleries have over 40 coats of ochre over the millenniums.