Medieval Arabs had manuscripts of many ancient Greek texts, which were translated into Arabic when there was a demand for them.
Conclusion (evidently)
Medieval Arab poets didn't have much interest in Aristotle's Poetics.
Evidence
When people were interested in a Greek text (such as Aristotle or Homer), it got translated into Arabic.
If a poet were interested in Aristotle's Poetics, then they would also be interested in reading Homer. But Homer was not translated into Arabic until long after medieval times.
Evaluate
This is certainly a very confusing read. It would be especially hard if a student were unaware that Aristotle and Homer are examples of ancient Greek texts.
The argument seems pretty reasonable. It's going off a couple conditionals:
Medieval Arabs → text gets translated interested in text from Greek to Arab
If Homer wasn't translated into Arab until modern times, then the conditional does tell us that Medieval Arabs weren't interested in Homer.
But the author is trying to prove that the Medieval Arab poets weren't interested in Aristotle's Poetics, based on the fact that anyone who read that would have wanted to read Homer, since Aristotle refers to Homer.
Where is a gap in this argument? It seems like maybe the Arab poets could have been interested in Aristotle's Poetics and just had some other way to understand the parts about Homer (maybe they wouldn't really need Homer's works translated in order to follow the references Aristotle makes).
Goal
Not really sure what to look for here. We want to be more convinced that medieval Arab poets weren't interested in Aristotle's Poetics. The answer might provide an additional reason for believing that, or it might help us squash out any doubt by making it seem even more like, .