She might be refering to the findings in this paper: https://proceedings.neurips.cc/paper_files/paper/2019/file/959ab9a0695c467e7caf75431a872e5c-Paper.pdf
She might be refering to the findings in this paper: https://proceedings.neurips.cc/paper_files/paper/2019/file/959ab9a0695c467e7caf75431a872e5c-Paper.pdf