I know I'm beating a dead horse, but...
Just like the "Nancy Markle" email hoax, post 44 seems to me another example of Chinese whispers where nutrition and medicine are concerned. I'm pretty sure the poster is referring to cephalic phase insulin release, which is still being studied as it relates to non-nutritive sweeteners, and theorises that a small release of insulin after tasting something sweet triggers the appetite and encourages people to seek calories... though as I said, the evidence is mixed. But the post seemed to imply it's insulin itself that raises blood glucose levels?
Makes no sense. If the poster's wife is sticking to her diet, then how can something with no calories, and no carbohydrates raise sugar levels?
The only artificial sweetener I know of that could possibly be a culprit is Splenda as dextrose is used as bulking agent. But I'm sure you'd have to consume a fair amount to see a significant impact.
Sugar alcohols, on the other hand, which have half the calories as sugar, and are often used as a sugar substitute, are well-known to have somewhat dramatic effect on quite a few people. If anyone has ever read Amazon's reviews of the sugar-free gummy bears, they'll know what I'm talking about!