Why is the story that Cyrus diverted the Euphrates River to enter Babylon uncertain?

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Reconstructed Ishtar Gate at Babylon near Al-Hillah, Iraq, featuring blue walls decorated with rows of yellow and white animal reliefs and a central arched entrance. — Babylon A reconstruction of the Ishtar Gate at the ruins of Babylon, near modern Al-Ḥillah, Iraq.

The story that Cyrus the Great gained entry to Babylon in 539 BCE by diverting the Euphrates River is considered a legend rather than established fact. This account is deemed uncertain because it remains unconfirmed by any contemporary sources.12

Historical evidence indicates that the fall of Babylon was actually swift and occurred with little to no resistance. Rather than requiring a complex engineering feat to bypass the city's defenses, Cyrus benefited from internal disaffection within the city. Many Babylonians, including the powerful priesthood of the god Marduk, were dissatisfied with the reigning king, Nabonidus. Consequently, these groups were willing to support Cyrus, who entered the city and was hailed as a legitimate successor to the throne.342