This is great, we need more lifestyle approaches to disease. Not just people hoping a magic pill will fix it without them having to change their behavior.
Type 1 and Type 2 diabetes are completely different conversations, but regardless everyone should try to take lifestyle approaches to improving their health (in addition to whatever is medically necessary).
Yes, this is very important: Diet can be a complement to medical treatment, not a replacement. Don't make Steve Jobs' mistake!
Even going very low carb, gluconeogenesis paths can still cause a diabetic to have very elevated blood sugar... It's about keeping things as level as possible and a non-invasive monitoring path can help a lot...
I was very low carb (fewer than 30g/day) for over a year, and was still hospitalized for ketoacidosis.