How can you "debunk Sitchin" when he is only quoting the most widely accepted translations of the Sumerian texts by the likes of Samuel Noah Kramer? For the New World research he quotes the likes of William H. Prescott, and Victor W. VonHagen.
These were the giants of archaeology long before Sitchin wrote his books.
All his sources are the most mainstream and reputable.
Sitchin just took the texts at face value and popularised them.