Maybe “rock solid” could be understood as slightly hyperbolic (though it is metaphorical, so hard to say whether it is really hyperbole), but, it is possible to predict some things probabilistically with a high degree of accuracy. Depending on the task, a high enough degree of accuracy sounds doable, and if it offers a sufficiently convenient fallback to an actual human when it fails, that sounds like it could be quite a bit nicer than navigating a phone tree menu?

Classical voice to text combined with NN based voice to text, I would imagine can be highly accurate, and that’s probabilistic.