While Copilot in Excel does provide explanations for formulas and insights in a grammatically correct manner, the generated content may sometimes be inaccurate. This can happen due to misunderstandings or misinterpretations of your requests. Copilot openly notifies users with a transparent warning stating that "AI-generated content may be incorrect". Therefore, it's important to double-check the generated formulas and visuals before inserting them into your worksheets.