Quite simply put it's very dangerous to recommend a diet high in carbs when there is a great chance that a person's AF could be caused by gut infections. When the intestinal mucosa is compromised because of this....your immune system gets hit and you also develop a body full of inflammation. Going on such a high carb root might bring temporary relief but if there are hidden gut infecitons and subsequently inflammed intestines this type of diet will do MUCH more harm than good in the long run.
We have to remember that something is causing AF....internally. You gotta get the bad stuff out....while supporting your body as much as you can in the process. A high carb diet is counterproductive.