I take it the purpose of Info Source was to make it easier for requesters to understand how to best go about it. Generally, then, Info Source was a specific way to assist individuals. I don't know what the answer is, but I think you may want to look into prescribing some more specific version of the duty to assist, ensuring that Info Source and its underlying purpose live on online.
I asked the ministers when they were here about the rationale for not going further in applying the act to ministers' offices. One of the answers was cabinet deliberations, but as I understand it—and correct me if I'm wrong—the act currently has a mandatory exclusion in relation to cabinet confidences, and there are exemptions in relation to advice and recommendations to ministers. So I don't completely understand the rationale. Perhaps you could clear up that confusion.