Technically, it involves three people. The interrogator is supposed to pick which unseen participant is human. (Originally proposed as, picking which participant is a woman. Chatbots being extremely not invented yet.) If people can’t tell the difference - there is no difference.

LLMs definitely are not there. I doubt they ever will be. They’re the wrong shape of network. I object when people say there’s nothing like cognition going on inside, but ‘what’s the next word’ is estimating the wrong function, for a machine to be smart enough to notice when it’s wrong.