> Most games are sitting on top of engines that do almost all the heavy lifting

What? Yes, most game use engines, but all of them customize gameplay systems, graphics/shaders, UI, etc dramatically. That's like saying that most programs are easy to reverse engineer because Windows/Linux are doing almost all of the heavy lifting.

> so the AI just has to reverse engineer the assets, gameplay and levels from footage.

The word "just" is doing an incredible amount of lifting here, you're basically appealing to "AI is magic and will eventually be able to do everything". If that's your argument I can't dispute it I guess, but the fact is that at the current time there has not been an example of AI reverse engineering a modern video game from gameplay footage alone.