This kind of reminds me of when someone reverse engineers a piece of software to document interfaces, protocols or APIs for the purpose of writing compatible software. Then a second person not involved in the RE process implement compatible software from the documentation the first person wrote.

This is to avoid any contamination and verbatim copies of code. Once you have read a piece of code there is a risk of "contamination" and you will be influenced by it. It does not matter if you directly copy it, write it out from memory or use an AI to regurgitate it. It will be a copy of the code. To me this is very clear.