> 800 years (that's more than European living in America now) muslim Spanish empire with its knowledge center in Toledo

The Muslim dominion of the Iberian Peninsula did not last 800 years. The Muslim invasion started in 711 CE, and by 1085 Toledo has fallen back to the Christian kingdom of León. Granada would eventually be conquered in 1492, but most of the old Visigothic Kingdom was already in the hands of the Christians.

> This center was later captured in 11th century CE, and this event essentially started the Western Renaissance movement in Europe.

Islamic contribution within the context of European history should be both acknowledged and recognized as being autoctonous, but attributing to it things that well attested through other pathways works against it and reinforces myths historians are toiling to get rid of.

The Renaissance as we know it was kickstarted by the conquest of Constantinople in 1204 by the French and Italians, that's well documented and broadly agreed on by historians. All of this happened on the foundations laid down from the 11th c. onwards as the post-Carolingian world was stabilized.

It's not like Tariq ibn Ziyad invented the concept of intentionally making a retreat impossible in order to compel soldiers to fight. There are proverbs about this kind of thing that predate him by centuries: https://en.wiktionary.org/wiki/%E7%A0%B4%E9%87%9C%E6%B2%89%E... It's probably a popular story to tell because it raises the stakes and provides for dramatic tension: either the battle is won or the army will be annihilated. But I suspect there've been quite a few unlucky commanders who tried this, got annihilated, and never had their heroism praised in history books.