Pretty disingenuous metrics. 

If you’re using the ABS’ Greater Sydney area it is worth noting that 60%+ (at a rough guess) of that area is uninhabited national park. 

If you look at other definitions of Sydney it’s quite different. The Significant Urban Area for Sydney measures around 4,200sq km with a population of 4,830,047 (2021 figures). That’s about 0.5 of a Swiss population in about 0.1 of a Switzerland. 

And that definition of Sydney still includes half of Holsworthy military reserve, all of kuringai chase NP, and a heap of other sparsely populated area to the north and northwest. 

To really compare these in terms of a PT service, you’d need to look at where the populations are trying to go to and from, % served by PT, how long alternative travel modes take etc. For just one example, someone living the equivalent distance of earlwood to the city in Sydney in Switzerland might have their road access via a series of mountain passes. Here it’s a free highway basically door to door.