Hocknull suggested that Austrosaurus mckillopi differed only slightly from the QMF 7292, the holotype of Wintonotitan wattsii, and should be considered a nomen dubium.

The Winton Formation had a faunal assemblage including bivalves, gastropods, insects, the lungfish Metaceratodus, turtles, the crocodilian Isisfordia, pterosaurs, and several types of dinosaurs, such as the theropod Australovenator, the sauropod Diamantinasaurus, and unnamed ankylosaurians and ornithopods.

[4] In their 2009 description, Hocknull et al. found Wintonotitan to be a non-titanosaurian titanosauriform sauropod in their phylogenetic analyses.

[3] A similar placement was also recovered in several analyses in the subsequent years, including by Poropat et al. (2021) in their description of Diamantinasaurus fossil material.

[5][6] Their results are displayed in the cladogram below: Dongbeititan Euhelopodidae Sauroposeidon Tastavinsaurus Europatitan Ligabuesaurus Cloverly titanosauriform Chubutisaurus Wintonotitan Huanghetitan Andesaurus Huabeisaurus Dongyangosaurus Baotianmansaurus Savannasaurus