We most likely don't need new laws, because infringement is infringement and how you made the infringing work is irrelevant. Accidental infringement is already illegal in the US.
My own personal opinion is that the AI generated code (or pictures in the case of the article) should be under a new category of literary works, such that it does not receive copyright protection, but also does not violate existing copyright.
Humans tweaking the image is immaterial to this determination - if the human tweaked it so that it no longer seem to violate copyright, then that said panel would also make the same determination.
Of course you have no way to prove whether any image was or was not generated by AI so welcome to a new scam for law firms to aggressively sue artists claiming they suspect AI was used in their works.