So even if you used a piece of code it must have the tag.
By that logic, most things would need to have that "tag". You will not find much premade libraries, engines, operation system calls and so forth where you can certify that it does not contain a "made by AI, but modified by a human" line of code. By the same logic most pieces of software are not even (fully) created by the developer, since they are bound to have copied some piece for it out of a tutorial and modified it.
An image is not a game. You ask the AI for an image and hand edit it. That is still an AI generated image. If you put the image in a game, it therefore has AI generated assets.
If you ask the AI for a game and then hand edit it, that would be the same. The game is AI made.
But images are not the same clusterdump of individual parts as code. You do not use a body of stock super hero, put a custom drawn head on it and ask the internet how hair curls look and adapt the tutorial pics on your custom head and call it "your" image. But simpliefied that is what coding is. If you use an engine like Godot or Unity, 99+% of the code are not by the developer. And the chances are high that those 99% already have some AI in it or will have in a future version. AI tools and assistance are becoming a tool of the trade. Just like digital artists use a filler function to not color in the pixels by hand and apply a shading gradiant. Or how 3d render artists do not even draw at all but use a model and texture and let the software render the image. I wonder when or if those filler functions of Photoshop will be seen as such.
Ai generated sounds like all is made by ai only
Yup. The disclosure is quite unhelpful in the way it is now. If I look at Steam, the disclosure (that the user sees) is wordy. It describes what is actually done, so potential customers can make an informed decision, usually how they value the displayed art/story/whatever was described as being gen AI. And I do not even know if they ask or disclose code "assistance". Depending where you look, there are claims about how like a third of all lines of code is allegedly written by AI currently. Whatever that means, as most code is repetition with variation. There are bound to be games among those, and I have yet to see a Steam game with code disclosure.