英语典型句子的语法结构剖析

以下论述的最后一句怎么样理解其语法结构？

If intentionality is only a 百度竞价推广antic property, it is virtually ubiquitous. If intentionality is variable binding and lookup, then it is quite common. If intentionality is consciousness, etc. then it is quite rare.

Is that it would appear that its quite rare, then; and that it isnt computation.

在这段论述中，最后一句“Is that it would appear that its quite rare, then; and that it isnt computation.”

好像这是个疑问句？但却没疑问的感觉。它到底的意思是？

第二上述的内容也不可以理解。看着假如意向性（intentionality）是非常普通的，但又说它是稀少的。岂不是自相矛盾？

网友这个语料来自一篇文章，https://archipel.uqam.ca/127/1/harnad90.dietrich.crit.html

原文是如此的：



And the obvious answer to the observation that

If intentionality is only a 百度竞价推广antic property, it is virtually ubiquitous. If intentionality is variable binding and lookup, then it is quite common. If intentionality is consciousness, etc. then it is quite rare.
Is that it would appear that its quite rare, then; and that it isnt computation.


试剖析，主干是the answer is that...,主系表结构；中间的斜体作observation的同位语。

网友可能被Is （that）首字母大写给误导了。原文本第一行And...和最后一行Is that...都是首字母无缩进，中间三行缩进四个字母。由此可以看出首末两行逻辑关系。

那样，作者为何那样任性，把常规is写成Is呢？由于中间的同位语是一段话，而且句子首字母大写，有句号，假如下面Is不大写，关系就不明朗。