De Man's point is a question is both rhetorical and grammatical, and the one cannot be reduced to the other. Both readings are available.

德曼想指出的是，一个问句既是修辞型问句又是语法型问句，那么一个不能变成另一个，两种理解都有效。

耶鲁公开课 - 文学理论导论课程节选

That is lectures teaching, three hours of lecture and two hours of recitation.

就是讲座-背诵型，三个小时的讲座,和两小时的背诵。

麻省理工公开课 - 媒体、教育、市场课程节选

Now there are two types of diabetes, as you may know, there's Type I Diabetes which is a genetic abnormality that usually shows up in childhood or adolescents where people are dependent on insulin.

你们可能知道,糖尿病有两种类型,Ⅰ型糖尿病是由基因异常引起的,在儿童和青少年中较为多见,患这种病需要长期依赖胰岛素

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选