This is thinly veiled racist fear mongering from a right wing blog designed to look like a legitimate news organization. Nowhere in that linked slide deck is there anything about "adjusting grading scales to account for the skin color or ethnicity of its students."
Thanks for sharing this URL - I'll make sure to automatically flag it every time I see it on HN.
https://www.oprfhs.org/news/1742090/statement-regarding-grad...