I agree the author/experimenter seems to have done most of the conlanging here. The development benefit comes, I think, from having the AI reflect back the work so the experimenter can correct output and consider their conlanging decisions (eg use vowels for case marking).

I'm now wondering how the AI would cope with one of my conlangs. I have example sentences already - https://docs.google.com/document/d/1YT9KzgvFu8DNWVL02t1NGgRS...