Not if you count all the energy that was necessary to feed, shelter and keep the the human at his preferred temperature so that he can sit in front of a computer and solve the problem.
Try again.
A single human is indeed more efficent, and way more flexible and actually just general intelligence.
...
People who write the stuff like the poster above you... are bizzaro. Absolutely bizarro. Did the LLM manfiest itself into existence? Wtf.
Edit, just got confirmation about the bizarro-ness after looking at his youtube.