LiveO2 is a training device instead of a medical therapy.
The easy way to understand this is by considering what LiveO2 does. Oxygen is for the whole body.
LiveO2 is intended to optimize health by improving energy production for the whole body. If LiveO2 was meant to cure a specific ailment — it would be a therapy.
LiveO2 helps the whole body. As such, is not intended to treat, cure, mitigate, or prevent any disease or health condition. If it were, it would be a medical device.
Products intended to treat specific conditions are therapy.