Indeed, Anwyl was the only Labor MP to lose her seat at that election. However, as a measure of how the ground had shifted from under Labor, Anwyl only led Birney by eight votes on the first count, and lost when One Nation preferences flowed overwhelmingly to Birney.
The passage highlights how Anwyl's loss, despite being the only Labor MP to be defeated, reflects the broader trend of Labor losing ground in that election due to One Nation preferences favoring Birney.