This won’t even work for a week, as when you manipulate a picture with AI it is completely irrelevant to the AI what is in the picture. The AI generates a completely new image and copies a region of the old image over, like good old Photoshop. All the AI need is a bit of guidance so the new image and the original line up, but that’s easy to produce, can be done by numerous methods or even manually in seconds if absolutely necessary.
If you want to stop manipulations, we already have tools for that: Just put a cryptographic signature on all the stuff you publish. That won’t stop manipulations, but it makes it very easy to see that an image was manipulated. That said, the tools have been around for 25 years and never gained any traction, people just don’t care that much.