The article discusses the risk of material misstatement in BHP's annual report in 2018 and how it impacts the auditor KPMG in the assessment process of the financial statement. It identifies various events that may lead to material misstatement, such as the Gulf of Mexico financial loss, low-price environment, and Samarco dam failure. The article also explains the stages of audit evidence in the context of BHP and the importance of assessing material risks.