You are missing an important point.
It significantly lowers the barrier to make a game, if you have a good idea.
The barrier to creation has been lowered. But, when you can create anything, you still have to dig to figure out what you actually want.
Try actually doing this though and it'll look like an absolute mess. You'll end up without any sort of cohesive art style and you'll have random variations in quality level. The thing about this AI generated stuff is that what it lacks in 'peak talent' it more than makes up for it in being able to actually produce something cohesive.
Oh look: exactly the result with AI tools.
Did you miss the point where the author went through multiple variations, had to construct intricate prompts and do quite a lot of manual work for the end result to be half-decent?