I was confused as well. I don't recall seeing this the first time I read the article, but on the second time through, they include this: "Our research reveals t

I was confused as well. I don't recall seeing this the first time I read the article, but on the second time through, they include this: "Our research reveals that Plimpton 322 describes the shapes of right-angle triangles using a novel kind of trigonometry based on ratios, not angles and circles. It is a fascinating mathematical work that demonstrates undoubted genius." Which is probably where the "more accurate" statement comes from.