Jeff Novick's article: Potatoes & Diabetes: Dietary Trends & Truths About Taters (2010).
Potatoes in the Western diet are predominantly consumed as french fries, or as 'meat & potatoes' or as potato salad. In all these recipes, fats (quite often unhealthy) are added in the form of oils, butter, cheese or sour cream. Hardly anybody eats simple potato recipes in the form of 'potato sabzi' or boiled potatoes with lemon & spices. So is it the potatoes causing diabetes and hypertension, or how they are cooked (deep fried) or how they are eaten (with unhealthy fats)? Teasing out the effects of these confounding variables has been a challenge.
Generally speaking, Whole Food Plant-Based doctors are comfortable with potato consumption for diabetes. Below are Dr Barnard's videos, for example:
(5 mins) Transcript. Dr Greger's summary: "Does the link between white potatoes and diabetes extend to non-fried potatoes without butter or sour cream?"
(6 mins) Transcript. Dr Greger's summary: "Do potato eaters live longer or shorter lives than non-potato eaters?"
This video is not focused on potatoes or sweet potatoes. It is focused on diabetes reversal. During the video, Dr Barnard mentions potatoes as healthful foods. He also mentions that sweet potatoes are nutritionally superior.
A potato-centric recipe from Dr Barnard's book: Dr. Neal Barnard's Cookbook for Reversing Diabetes (240 pages, 2018).