There is one class of languages missing in the comparison: Programming golf languages: E.g. Japt [1], Pyth [2] or Jelly [3].
Update: I noticed that the author mentions that "APL's famous terseness isn't a plus for LLMs." Isn't that just a design limitation of the LLM tokenizers?
[1]: https://github.com/ETHproductions/japt
[2]: https://github.com/isaacg1/pyth
[3]: https://github.com/DennisMitchell/jellylanguage