I agree. Disclosure of A.I. use should be mandatory.
My main concern with A.I. use is its ability to hide incompetence. If a new agent introduces code that was entirely written by illegal-software that violates copyright law--A.I.--then that should be made clear, even if competent-programmers review the new inclusion and approve of it. Otherwise people are left with the impression that this new agent is a competent programmer. A.I. use--undisclosed--creates false reputations.
The disclosure being encouraged and not mandatory is purely to protect the egos of programmers currently utilizing A.I. products.
However I do respect their decision and I maintain projects should be self governing.