You can generate a sound, but how do you know you generated the right sound? That's the point from the article that everyone seems to be missing. The problem

You can generate a sound, but how do you know you generated the right sound? That's the point from the article that everyone seems to be missing. The problem isn't bounded because you can't know that your simulation is correct in finite time. For that to actually matter you need to be simulating a more complex circuit than the one they give, but not by much: stick a feedback loop in and it gets funky.