My brother-in-law is diabetic, and doesn't like to hold strictly to his recommended diet; one food which is good for him to eat is sweet potato. However, he "doesn't like them", and can sniff them out at 100 paces. My wife plays exactly this game of trying to find ways to fool him into eating them by incorporating them into unexpected recipes - most successful have been a soup with tomato and sweet pepper, and chocolate brownies.
That makes no sense whatsoever.
Potatoes are NOT beneficial for people with type 2 diabetes (insulin resistance, a genetic condition triggered by overweight, lack of excercise, and/or old age). I assume its type 2 because type 1 cannot be managed with any diet whatsoever - they simply have to monitor what they eat and take insulin accordingly.
Potatoes are starch, which is carbohydrates (as is sugar). All carbohydrates are converted by the body into blood sugar, aka glucose. Diabetes is when the body can no longer regulate the blood sugar sufficiently and it raises to unhealthy levels.
The easiest way to handle type 2 diabetes is really to just eat without carbohydrates, but instead get all your energy exclusively from fat and proteines - so thats stuff like vegetables, nuts, meat. Unfortunately a very expensive diet, carbohydrates are cheap.
The other possible diet is to accompany any carbohydrates - like potatoes, or wheat products like bread, or fruits etc - with lots of fiber and/or fat because that slows down the absorption of the carbohydrates in the stomach.
The third option is of course medication and the last is insulin, even for type 2 diabetes. Really the best treatment is losing weight, and excercising 3 times a week, with a day rest between the exercises.
Really forcefeeding a person with diabetes potatoes when they dont like them makes no sense whatsoever. While potatoes are not so bad in regards to already present fiber, so as a source of carbohydrates they are nice - they are really more of the problem than the solution.