Uh yes? Spain was part of the Umayyad Caliphate and then various other Caliphates until the Reconquista ended Islamic Spain in 1491. Islam never lost Aristotle.
Saying that Europe largely lost Aristotle isn't propagating the myth, repeating Hegel and Descartes Eurocentric views is, as is saying civilization is fragile when it survived fine.
A lot of the reason the European's liked old things is that they could then claim it was European knowledge rather than Islamic. Examples include Aquinas commissioning a translation of Aristotle from Greek sources, as the existing copies were translated from Arabic.
As for sources, yours only shows that Aquinas rationalised Aristotle and Catholicism, which is true. On what I've said, if you didn't know about Al-Andalus I don't know where to begin. Anything about the Umayyad Caliphate would be a start, or almost any modern history of the age.
I'm also completely ignoring that the "Fall of Rome" happened in 1453, largely considered the end of the Middle Ages.