So, you attempt to refute it by using an entirely different flight?
They're heading east (or wait, west cuz they're starting at Sydney).
This is not hard. Shorter distance is sometimes a straight line.
West is a longer trip over water. But they did it that way. Southern hemisphere trips sometimes do stuff like this.
Great circle routes are less commonly used in the Southern Hemisphere primarily due to the challenges posed by weather conditions and ocean currents, which can make alternative routes more favorable for navigation. Additionally, the geography and distribution of landmasses in the Southern Hemisphere can limit the efficiency of great circle navigation compared to the Northern Hemisphere.
Basically, this doesn't prove anything because there are different navigation challenges.
And you're basically shouting at me because I won't draw out this sun path. These smartphone kids and their inability to visualize.

Same as San Francisco to Tokyo except a lower circle.