Sitting and relaxing for a few minutes is probably always a helpful practice. But are you really learning to focus, or are you learning to respond to audio cues? Maybe both.
I'm not surprised your wife was experiencing anxiety. Honestly I see this introducing a lot of self-judgement into a person's meditation practice, considering how it creates a noisy distraction when you're doing it "wrong". Kinda seems like this practice could actually nullify many of the benefits of meditation without offering much to make up for it. Like a poorly condensed and extremely watered down sort of meditation that caters to the unhealthy habits of modern people instead of being a gentle practice in dismantling those habits.
Guess maybe I should keep an open mind but this device is material irony.
Music of the day/week/month/whatever:
The Bird and the Bees - Love Letter to Japan https://www.youtube.com/watch?v=TWYoIoqJURA