You're not entitled to know what specific tools were used to produce something, generally speaking.
In the absence of such an entitlement, not volunteering to disclose the tools used is not fraud.
In the absence of such an entitlement, not volunteering to disclose the tools used is not fraud.
If LLM generates some code but I edit it, does it become my own work? How much editing must be done?
How large is "largely" ? Exactly how many bits of information must come from my fingers tapping the keyboard in order for me to qualify for authorship? Be precise.
If I write something but the LLM polishes it up a bit, is it still my work? Or is it AI generated?
I'm not going to define substantive for you. That's something you should feel obligated to research and learn about yourself; anything less is dishonest.
So "consider copyright" isn't really strengthening your position.
There are some precedents and rulings related to copyright and AI, so we have at least some rubric by which "authorship" can be determined. But when it comes to AI doing polishing of existing code - that is less certain.