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Content density has been measured by various NLP methods. While I would not claim those methods are definitive or exhaustive, they are a starting point for independent benchmarking and self-regulation.

Brown, Cati, Tony Snodgrass, Susan J. Kemper, Ruth Herman, and Michael A. Covington. "Automatic measurement of propositional idea density from part-of-speech tagging." Behavior research methods 40, no. 2 (2008): 540-545.

Snowdon, David A., Susan J. Kemper, James A. Mortimer, Lydia H. Greiner, David R. Wekstein, and William R. Markesbery. "Linguistic ability in early life and cognitive function and Alzheimer's disease in late life: Findings from the Nun Study." Jama 275, no. 7 (1996): 528-532.