Only something created by a human can be copyrightable. (See the copyright status of monkey who took a selfie for precedent).

Any code written by an LLM is not copywritable because a human did not write it.

Also the company that trained the LLM is likely in breach of the licenses the code palls under.

If the rewrite is based on something which has a license that your company can’t use, then the rewrite likely can’t be used either

write something that already exists so it doesn’t need to think

If something already exists, it shouldn’t need to be rewritten.

Doing otherwise is a sign that something has gone wrong.

That was the case before LLMs and it is still the case today.