The article is a bit misleading. The kind of wearable he means are glucose level measuring devices. This link is a bit better:

https://www.reuters.com/business/healthcare-pharmaceuticals/...

Granted with such a device you still have to do something with the data for it to make you better, but I think this makes a lot more sense. Many people are diabetes 2, or close to it, and they have no idea. A continuous glucose measuring device could very quickly be a real eye-opener, in a way a fitness tracker does not. --> I don't need no Fitbit to tell me, I skipped my 5k again, but I do need a sensor to tell me that my blood glucose is too high.