章振邦教授应该是援引CGEL的观点，请看下面的解释：

In some frameworks (e.g.CGEL) nominal clauses can be that-clauses,interrogative clauses,exclamative clauses,free relative clauses(also nominal relative clauses),to-infinitive clauses,or -ing clauses.They typically function as subject,direct object,apposition,or complement in sentence/clause structure:

What happened next remains a mystery.(S)

To err is human.(S)

He alleges that he doesn't remember a thing.(O)

The question is how we should proceed.(C)

All l did was laugh.(complement)

I'm not sure if we should report this.(complement of adjective)

lt depends on what happens next.(complement of preposition)

He is talking about facing the music.(complement of preposition)

The question,whether this is a criminal matter,is not easy to answer.(apposition)

所以，根据上面原文的解释，nominal clauses can be…还有They typically function as…，一个是名词性分句的具体分类，一个是名词性分句的句法功能，所以，名称的区别，应该是名词性分句充当不同句法功能导致的，例如：that-clauses,interrogative clauses按照句法功能，充当主语时，它们应该都可以称为主语分句/从句（subject clause)，和其本身是that分句或疑问分句不冲突。

个人理解，仅供参考。

我不太熟悉语法理论，但按照网友所提供的信息源，我查了一下，从字面上我是这样理解的：

that分句做宾语可以叫宾语分句。但名词性疑问词wh分句在做宾语时，该书仅提到做宾语，没有用宾语分句这个提法（和that引导的名词性分句不同），可能因为通常它起名词词组的作用，一般把它看作名词词组。在传统语法中可以叫宾语从句。

个人理解，不一定对，有错误地方，请大家纠正和补充。