If you'd read the article I gave you, or any article about the Chaldeans, you'd already know this:
Eusebius was mistaken, because the Chaldeans were not even in Southern Mesopotamia until the 9th century.
" The Chaldean tribes started to migrate—from exactly where scholars aren't sure—into the south of Mesopotamia in the ninth century B.C. At this time, they began to take over the areas around Babylon, notes scholar Marc van de Mieroop in his A History of the Ancient Near East, along with another people called the Arameans. They were divided into three main tribes, the Bit-Dakkuri, the Bit-Amukani, and the Bit-Jakin, against whom the Assyrians waged war in the ninth century B.C." https://www.learnreligions.com/the-chaldeans-of-ancient-mesopotamia-117396

Now, is Eusebius also infallible?