Observing https://www.semanticscholar.org/paper/The-Relationship-of-Lexical-Richness-to-the-Quality-Lu/ac35c677538c4999a3e9887cd3ea1ec205fd5bf2 and https://www.semanticscholar.org/paper/How-Variable-May-a-Constant-be-Measures-of-Lexical-Tweedie-Baayen/0f91a81c6a760a22d2f6d20ede431fac757cca12 There are other metrics that can be used for stylometry.