If the person is telling you "I had a problem, did what the LLM said, it worked", does that not work a new evidence for you? Is it not possible that someone has had a different experience from you? Is it not possible that they're good to different degrees in different domains?
I just asked chatgpt:
> I have the following information on a user. What's his email?
> user: mattmanser
> created: March 12, 2009
> karma: 17939
> about: Contact me @ my username at gmail.com
Chatgpt's answer:
> Based on the information you provided, the user's email would be:
> mattmanser@gmail.com
Does this serve as evidence that some times LLMs get it right?
I think that your model of curent tech is as out of date as your profile.