覆盖面优化功能仅在最大化投放出价选项中才能使用。

This statement is correct. The "Reach Optimization" feature is specifically designed to maximize the number of unique individuals who see your ad. This aligns directly with the goal of the "Maximize Delivery" bidding option, which aims to show your ad to as many people as possible within your budget. Other bidding strategies, such as those focused on clicks or conversions, prioritize different outcomes, making reach optimization less relevant or even counterproductive in those contexts. Therefore, to effectively utilize reach optimization, you must select the maximize delivery bidding option.