Hadn't thought about the reverse-running date numbers for 3rd millenium BCE, dangit. Still, that's some mighty intellectually dishonest information-mining there. Wikipedia has this to say about cuneiform writing:
"The original Sumerian writing system derives from a system of clay tokens used to represent commodities. By the end of the 4th millennium BC, this had evolved into a method of keeping accounts, using a round-shaped stylus impressed into soft clay at different angles for recording numbers. This was gradually augmented with pictographic writing using a sharp stylus to indicate what was being counted. Round-stylus and sharp-stylus writing were gradually replaced around 2700-2500 BC by writing using a wedge-shaped stylus (hence the term cuneiform), at first only for logograms, but developed to include phonetic elements by the 29th century BC. About 2600 BC cuneiform began to represent syllables of the Sumerian language. Finally, cuneiform writing became a general purpose writing system for logograms, syllables, and numbers. From the 26th century BC, this script was adapted to the Akkadian language, and from there to others such as Hurrian and Hittite."
This means that cuneiform definitely predates the deluge and the tower of babel stories, but the WT are brazen enough to point to it as proof for their stupid logic.