Is the Indus script indeed not a writing system?

Broken steatite mold carved into a unique fan-shape discovered in Harappa in 2001.

In 2008, Dr. Parpola published an updated second paper addressing the controversial Dr. Steve Farmer et. al thesis that the Indus script is actually not a writing system. It originally appeared as part of a felicitations volume in honor of Iravatham Mahadevan published in Chennai, India.