His timing seems good and his tying of Sumerian items of historty to the Bible and to Jewish Literature is remarkable. You can infer many missing items if you read carefully and have enough background of your own. He was a Rabinical Scholar before he found the Sumerian tablets which consumed the remainder of his working life.
You have to allow that a misconception can have repercussions, and his ideas on Nibiru might, or might not be accurate. Does it orbit with its several planets far out in the Oort Cloud? No one has sent a rocket out to look.
His characters will easily cross reference with other character names of that time ... If you want to really stretch your credulity, try reading about the beliefs of Anton Parks! Enjoy your research!
Gery Zeitlin ... English translation
Mind is the rider.