It's certainly possible someone could fake something like that for views, but I'm curious what you consider to be the tells that it's no longer an LLM behind the wheel?

Maybe it's LLM and human actor splitting work, but she looks too natural, too fast and too error-free to be LLM based since too long ago. Just their dictation -> thinking -> TTS loop is too fast to be LLM. Context awareness and character adherence is too perfect as well.