The article regularly conflates high sugar, with weight gain (aka calorific surplus). So it's hard to draw any useful conclusions from it.
Not surprised to see it on HN, they are very successful at having us do their bidding for them under cute and worthless platitudes like "calories in, calories out."
And speaking of science, if the scientists have or were to determine with certainty that it is harmful, what do you think the sugar industry would do in response? Stop selling it, keep selling it but tell the public they should consume much less, or launch a devious, well-funded campaign to mislead the public?