It is an election year you know.
But I think the Elephant in the room is the need for Australia to be online with the USA in the Hot War Against Russia In Ukraine and the Cold War Against China in the South China Sea.
The Australian government asking Biden to do this. Biden can drop the Assange case to help keep Australia in the NATO Camp against Russia and China.
Economic Warfare with China as it worsens will hit Australia hard.
Interesting theory. There’s always an angle with Biden. Your explanation sounds reasonable to me although I’m not sure about the China part. I don’t know that the Biden regime intends to do ANYTHING to counter China.