It wasn't my study nor do i have a lot of experience with diabetes
An obese person with type2 diabetes has an insulin resistance. It takes a longer time after each meal for the body to reach a "normal" insulin lvl.
The argumentation was that if such a person eats 6 meals during the day (even when they are small), their insulin lvl would constantly be on a high lvl, which is bad for fat burning.
So if a person with insulin resistance wants to loose weight they should eat max 2 times a day in the beginning (with very low cal probably ~1000cal/day) in order to reach a low insulin lvl and finally break the vicious circle.
Can you provide a link? This does not sound like a particularly good idea on more than one level (at least, the way you are telling it). A large meal will result in a correspondingly large sugar spike, which means the pancreas tries to meet the flood of sugar with a large burst of insulin. Insulin resistance means that blood sugar remains high despite these attempts, so the pancreas works overtime, producing as much as it can, flooding the body with insulin. Eventually, the sugars go down, but it takes a long time. This is where artificial insulin and meds come into the picture. Some meds increase insulin resistance, others force the pancreas to produce more insulin, others reduce absorbability of carbohydrates from the GI tract, and so on. Obviously artificial insulin provides boost to natural insulin.
With smaller meals, there is a lower spike in blood sugar levels and a correspondingly lower insulin level, meaning that sugar returns to baseline much faster. High blood sugars are problematic for diabetics because they cause vascular and nerve damage, which leads to very, very, very bad things. The short list is heart problems, kidney problems, dementia, amputated limbs, blindness, and frequent hospital visits. If your concern for weight loss is "high insulin levels" (a questionable concern in itself) large meals does not really fit the bill.
With a very low level of calorie intake like 1,000 calories (which wouldn't keep Kate Moss alive) the diabetic is likely to lose lean body mass, which makes insulin resistance even worse. I don't see the upside. You could easily produce a weight loss with a large enough calorie deficit (which usually happens as a consequence of STICKING TO the diabetic carbohydrate-controlled diet anyway) and get better blood sugar control.