I saw a presentation by him a few years ago[1] and I think the best characterization I could come up with is "Nobel Disease". He doesn't literally have a Nobel, but I think his early success has gone to his head and he seems to imagine himself an expert[2] on things that he is manifestly not.

[1] On a subject that I could reasonably be called an expert on. No, I will not elaborate for reasons of pseudonymity. Take that for what it's worth.

[2] As if we even had objective criteria for judging language design at this point in time.