"human expert" as reference for "factually correct", oh just gently caress yourself. Appeal to authority (expert = social status) is as much bullshit as appeal to popularity.
Right now the fully deterministic always correct oracle machine doesn't exist. The most authorative answer we can get on a subject is from a respected human in their field (who is still stochastic). It's unrealistic to hold LLMs to a higher standard than that.
- Jacob Veldhuyzen van Zanten, respected aviation expert, 1977 teneriffa, brushing off the flight engineers concern about another machine on the runway