See
https://www.mumc.org.au/history"1965–1966: Mt. Feathertop Hut construction begins during the summer. Funds are raised through donations, raffles and functions. Final cost of the hut is £2,480. Establishment of the Mt. Feathertop Hut enables the Empress Track to be cleared around July 1965: Empress Track is named after Empress Hut, where Hatt and Judge last stayed before their deaths. The upper section of the Empress Track later becomes known as the Tom Kneen Track and the lower half becomes North West Spur track; however, the latter appellation is commonly applied to the entire route to the MUMC Hut."
So it seems that the Tom Kneen Track is from MUMC Hut to the junction on Feathertop, and NW Spur Track is below MUMC Hut.