None too swift this author,leaving as she did such a gaping hole in the argument.

我认为，此句有误。漏掉了一个关键词 was。

None too 是一个习语。意为“一点也不”，副词用法，修饰形容词swift。

本句的特征是：由于否定词汇放在句子开头，引出倒装。句子应为：

None too swift was this author,leaving as she did such a gaping hole in the argument.

【分析】

None too swift （表语）was （系动词）this author（主语）,leaving as she did such a gaping hole in the argument. （结果状语）

as she did 也看作习语，不要继续分析了。字面意思：正如她所为。引申为“事实上；实际上；其实”。

【翻译】这位作者毫无敏捷可言，其实在她的论述中留下了如此大的漏洞。