"The study found that participants who consumed at least five ounces of any type of chocolate per week had a 10% lower risk of T2D compared to those who never or rarely consumed chocolate. Dark chocolate had an even bigger impact: Participants who consumed at least five servings of this chocolate per week showed a 21% lower risk of T2D. The researchers also observed a 3% reduction in risk for every serving of dark chocolate consumed per week. Consumption of milk chocolate, meanwhile, was not associated with reduced T2D risk. Increased consumption of milk chocolate, but not dark chocolate, was associated with long-term weight gain, a potential contributor to the development of T2D."
First, the writer says that consumption of any type of chocolate results in 10% lower risk of T2D, then later on they say that consumption of milk chocolate was not associated with reduced risk.