What I said was true... below is the summary of one of historian, but it reflects the consensus of many...

The Crusaders brought back far more than just the revival of ideas and achievements of classical antiquity... Located at the crossroads of Africa, Asia, and Europe and with the Muslims have conquered North African and much of Central and South Asia, it not only engaged in trade but became a conduit of learning between cultures as well as building on them.

Some of the Islamic technologies include...

https://en.wikipedia.org/wiki/List_of_inventions_in_the_medieval_Islamic_world

So, you are correct, there is a huge difference between being the reservoir of prior knowledge and the development of new knowledge. Except you are wrong to reduce Muslim contributions to science, math, etc. to simply preserving knowledge of the classical antiquity. It was so much more than that.

"Mathematics during the Golden Age of Islam, especially during the 9th and 10th centuries, was built on Greek mathematics (Euclid, Archimedes, Apollonius) and Indian mathematics (Aryabhata, Brahmagupta). Important progress was made, such as full development of the decimal place-value system to include decimal fractions, the first systematized study of algebra, and advances in geometry and trigonometry."

This integration of past knowledge from the Greek and Roman antiquity, Indian sources, and Arabic sources formed the foundation for major advances in these areas by Islamic scholars.