Nobody so far seems to have posted one of the key facts in the comments from the article:
Eleven people with type 2 diabetes (49.5±2.5y, BMI 33.6±1.2, 9M/2F)
Which I take to mean people between 47 and 52 with a BMI between 32.4 and 34.8.
As stated upthread, this specific diet is to clear fat out of the liver and pancreas.
The most interesting result is that some passed the glucose tolerance test afterwards.
So unless you fall within that age and weight range then this may not be applicable.
The major difference I see from a tightly controlled low carb diet is that I don't think I have seen anyone posting about a low carb diet stating that they can pass the glucose tolerance test - mainly I think if they deviate from the diet their blood sugar goes all over the place.
I would be interested to know if people who have achieved partial control through diet and exercise can also cleanse their liver and pancreas by a short term low calorie diet or if this only applies to people in a certain age range and weight range.
Certainly a 'crash diet' to get some more weight off becomes more bearable if you also have the chance of reviving your pancreas!
Cheers
LGC