There are tools that are being used to attempt to detect if a piece of work is AI-generated. If those tools say something was, it’s then on you to prove that you hand-created it.
They don't work. It's total bunk.
Even some artists are already having issues because things “look” AI-generated.
Exactly. See above. No one can (confidently) tell which is which. There's just educated guessing.
The whole point of Denuvo (and any DRM in games) is to prevent modifying the running code. Unless there's some kind of official modding system, there will be no way to inject DLLs or do anything else invasive to the running game.