I'm sure people who put the effort in other areas of their diet with NSS, will see results. But people who see NSS as a cheatcode to continue their habits might not see results.
Framing NSS as a way to not change habits and continue to enjoy various treats might obfuscate the mechanisms for losing weight and cause weight loss to not occur.
To the bad diet issue, diabetes is triggered by excess of carbohydrates hence the Association was sugar but sugar is not the only form of carbohydrate that causes insulin spikes and subsequent insulin resistance. Basically any cereal (aka grain) can spike the blood sugar to the point of causing diabetes. White rice, white flour lead the pack but as I've discovered with my CGM, any starchy food causes unacceptably high glucose spikes which leaves me eating nothing but non-starchy vegetables and meat.
2. A lot of people who try to cut sugar end up getting blind sided by carbs and starches, which become sugar during digestion. See above.
3. There are a lot of common staple items that are still sugarfied despite being marketed differently. How many people out there still think breakfast cereal is good for them? That yogurt advertising its antibiotic and other vitamins? There's a reason you have to turn the package around to see the sugar content.