I think that line in the summary is misleading. The full report says (emphasis mine):
Overall, we expect a 100% reduction in sugar-sweetened beverages consumption in a single country to reduce the global disease burden of diabetes mellitus type 2 by 0.02%.
So eliminating 100% of sugary beverage consumption in all 193 countries (# of countries used in the CEA) would prevent 3.86% of diabetes cases.
I think that line in the summary is misleading. The full report says (emphasis mine):
So eliminating 100% of sugary beverage consumption in all 193 countries (# of countries used in the CEA) would prevent 3.86% of diabetes cases.
You’re right—we should probably should update that to be clearer!