To me, this is pretty simple. I'm sure there is an element of racism in it. The size of the vote this party received suggests that it's more. Around 7% of the nation's vote, went to a party with a discredited leader & unknown candidates. Sure Pauline Hanson gets regular media in Australia. Prime-time live crosses on television & radio around Australia have kept her brand alive. Even that is no explanation for a result such as this.
To be honest I'm surprised the exodus from both major parties wasn't higher. They are out of touch. They park useless candidates that haven't performed in safe seats that they could sleep in unchallenged. If there was another election next week, this wouldn't change. That is the reason this pattern will only grow.