So glad you realize there were writers (plural) of Genesis. The documentary hypothesis seems to be well supported. As far as trusting anything written or linked on Wikipedia, I can only say LOL.
Pre-9th century Assyrian and Babylonian records (royal annals, boundary stones, economic tablets) list many ethnic groups in Mesopotamia (Akkadians, Kassites, Arameans, Elamites, Suteans, etc.), but the Chaldeans (Kaldu) are absent.
The first unambiguous appearance of their name is in the inscriptions of Ashurnasirpal II (883–859 BCE), who describes campaigns in southern Babylonia against the Kaldu (Glassner, Mesopotamian Chronicles, 2004, pp. 220–222).
The Hebrew Bible (BuyBull) refers to “Ur of the Chaldees” (Genesis 11:28, 31), but this is widely recognized as anachronistic: Ur had ceased to be inhabited by Chaldeans before the patriarchal period, and the Chaldeans did not exist in Abraham’s time (if dated to the 2nd millennium BCE). The phrase reflects the later reality of the 1st millennium BCE (cf. John Bright, A History of Israel, 4th ed., 2000, pp. 77–78).
The simplest way to put it: THERE WAS NO CITY CALLED "UR OF THE CHALDEES" and the BuyBull is full of Bull Shiit.
There is no evidence—textual, archaeological, or linguistic—of Chaldean presence in Mesopotamia before the 9th century BCE, thus, as with most everything Biblical, is completely unsupported by facts and evidence. . Their earlier placement in biblical or later traditions is retrojected from their prominence in the Neo-Babylonian period.