@Victoria Titans
There are some good free VPNs available, such as Proton and the VeePN chrome extension. Just connect to any country since Australia is the only restricted location for the games. You could subscribe to a paid VPN service, but if you are only going to because of the NBL Blitz games, then I suggest you just go with the free options above. Paying is overkill unless you want more privacy, torrenting, etc.
There is no need to do anything on YT, just connect to the VPN server and voila, you can now watch the Blitz game on the NBL Channel. Just hide the live chat because it can get pretty toxic and that's me being nice about it, especially on Adelaide or SEM games.