According to this, a question can make it into a "low quality" review queue because it was flagged as "not an answer." But the review task does not make any mention of it. It simply says that a post was flagged as low quality because of its length or content. There is a subtle difference, but it is there.
It's possible that an interesting non-answer is marked as "not an answer", but then it won't get deleted because reviewers will see "poor quality because of length or content" heading when presented with review tasks for that answer. And they won't agree with the assessment because they find the answer either interesting or appealing. The fact that it may be a poor answer to the question, as it was asked, simply may not enter a reviewer's field of attention.
The description in the review task should better reflect the flag (or at least the possibility that the answer made it into low-quality queue because of this flag). Can it be changed to say "this answer was flagged as low-quality because of its length and content or because it does not make an attempt to answer the question?"