That's like saying my house was framed by a hammer instead of a carpenter. AI is a just a tool with no agency. The people wielding the tool finished this expansion, just as the title says.
To be honest, you make a good point. The problem is generally that AI erases many of the tells of a quality work, because even bad works tend to carry the exact same level of language. When I see that the entire description was AI-generated, I wonder how many of these points were actually inspected by a real person or just hallucinated by the model. Surely there is some quality to it, but I feel like I would need more qualifiers than "finished" to know if it's worth trying, you know?
It's not exactly analogous to a hammer, even though I agree that it is a tool. If a carpenter got the framing all wrong, the hammer wouldn't fix it. If a prompter got the instructions all wrong, or didn't supervise enough, or didn't verify enough, the AI still makes something that appears to pass initial muster.
AI is fundamentally different to other tools because it directs itself for the most part (i.e. has agency) - the user typically only provides direction, that too usually vague direction. It's like calling a vending machine a tool for producing soda.