It's reasonable but afaik it's not really significantly better than other equivalent healthy lifestyle changes. I'm avoiding the term "diet" since that carries too much baggage, but you get what I'm driving at.

I think there's additional benefits if you're pre-diabetic as it takes the pressure off your body's capacity to manage your blood glucose levels.

It can be really good for some people, for others it doesn't work any better than other options, and it really doesn't work for some people. If you don't have any major health concerns then there's little harm in trying it but it's not like some massive cheat code where all the work of a healthy lifestyle is addressed by using this one simple trick.