Corn syrup is kind of a bogeyman in some circles because it contains a slightly higher fraction of fructose than sugar produced from beets or sugar cane. There might be a little something to that as fructose is metabolized through a different pathway than glucose and there is some correlation at the country level between consumption and diabetes rates. But with sugar it's really more the quantity that matters rather than the composition.
Were you attempting to post a different link? That study points a pretty strong negative correlation with corn syrup.
...Diabetes prevalence was 20% higher in countries with higher availability of HFCS compared to countries with low availability, and these differences were retained or strengthened after adjusting for country-level estimates of body mass index (BMI), population and gross domestic product (adjusted diabetes prevalence=8.0 vs. 6.7%, p=0.03; fasting plasma glucose=5.34 vs. 5.22 mmol/L, p=0.03) despite similarities in obesity and total sugar and calorie availability. These results suggest that countries with higher availability of HFCS have a higher prevalence of type 2 diabetes independent of obesity.
https://doi.org/10.1080/17441692.2012.736257