That seems a little unfair, given that we're seeing an essay to sell a much lengthier book. Some brevity is probably the author being strategic rather than un-self-aware.

Also, several of the claims do contain links for more information, such as simplification in music lyrics [0], melodies [1], and sentence-length in books [2].

[0] https://www.nature.com/articles/s41598-024-55742-x

[1] https://www.seresearch.qmul.ac.uk/chcc/news/4763/study-finds...

[2] https://www.economist.com/culture/2025/09/04/is-the-decline-...