Economical hydrogenated prose

This intriguing news item about how we are heading towards the hydrogen economy contains a fascinating claim: “More than 9 percent of a kilogram of the powder gets converted to hydrogen and little energy is lost through heat.”

What they presumably mean by more than 9 percent of a kilogram is “almost 100 grams”. But, why don’t they just say that instead of trying to sound all clever and technical using a percentage?