Yeah, thanks for confirming my argument. The video is pretty much bringing up the arguments I'd expect. But it really shows how weak they are when they complain about distances being too far when they are actually perfect for HSR and yes, it is enough if individual relations are close enough. That is how many HSR networks work.
But sure, Australia is the only country with mountains and suburbs. And kanguruhs are an unsurmountable issues for rail, but not for highways.
It all boils down to ideology. Weirdly enough it was not impossible to build inner urban highways though, which required much more space. But then, unlike road infrastructure, rail is required to be proftibale and that is why Australia remains underdeveloped and its airports overloaded.
Add to that wavering back and forth with financial support a generally hostile legal environment towards HSR projects and generally hostile laws to building important large national infrastructure, balooning costs on any infrastructure project. I would not be surprised if more money would have to be spent on bureaucracy and judicial things than on actually building that thing. That is not much different from the US where they need to pay multiple times more per km than in other Western countries with comparable corridors.