On 28 January 2020, Wyatt removed Cashman from the Senior Advisory Group after she was found to have provided a letter to conservative commentator Andrew Bolt, alleged to be from Yolngu elder Terry Yumbulul, supporting Cashman and denouncing Bruce Pascoe and his book Dark Emu. Bolt published it on his Herald Sun blog on 26 January 2020. The next day, Yumbulul released a statement saying that he had neither authored the letter nor given permission for it to be published in his name. Cashman said she helped Yumbulul write the letter at his request, and he had multiple communications with her about its content.
