Be careful with those numbers. He mentions that half the applicants didn't list a GPA. He also mentions that because of this, their are likely biases in those numbers. He makes mention of this in the comments.

Basically, the data isn't clear.

My point is that the author's conclusion is way more than a stretch.

There are lots of strange conclusions on the article. My favorite one is that degrees don't matter, because they pre-screen better the candidates that don't have one. But maybe, my favorite should be that a study about 5 job offers had any significance.

Anyway, it's very good to look at data for a change.

Unless there's a correlation between those with a GPA below 3.8 and those who made mistakes on their resume...