Certainly not in the case of asking it to do something you'd be slow at because you are unfamiliar. If you are not familiar enough with the system, how are you confident that what the LLM has produced is valid and complete? IMO the people saying LLMs make then 10x faster were either very bad to start with (like me!) or are not properly looking at the results before throwing them over the wall.

And how do you know if that is the case or the person/team using the LLMs is one of the good ones?

So the safest answer is just "no".