Note that the study is about things associated with heart disease - LDL and triglyceride levels - and not with actual heart disease.  I bet too that they didn't have any low carb people who didn't eat either the glucose or the high fructose corn syrup, or both of the higher carbohydrate groups would have shown worse triglyceride levels.

I also ran across a recent paper that shows that honey, despite being mostly glucose and fructose in the same proportions as high fructose corn syrup, doesn't have the same metabolic effect.  I'll put that in a thread of its own since honey is kind of one of those weird cases for paleo.  It does show the dangers of extrapolating from high fructose corn syrup to fructose generally, though.