This honestly feels like a diversion from the actual point which you proved: for some class of issues with LLMs, the underlying problem is learning how to use the tool effectively.
If you really need me to educate you on the meaning of opposite...
"contrary to one another or to a thing specified"
or
"diametrically different (as in nature or character)"
Are two relevant definitions here.
Saying something will 100% happen, and saying something will sometimes happen are diametrically opposed statements and contrary to each other. A concept can (and often will) have multiple opposites.
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But again, I'm not even holding them to that literal of a meaning.
If you told me even half the time you use an LLM the result is that it solves a completely different but simpler version of what you asked, my advice would still be to brush up on how to work with LLMs before diving in.
I'm really not sure why that's such a point of contention.