Robin Hanson also posted on this study - his post contains a longer passage from the paper.

The New Yorker article is misleading - it makes it sound like smarter people are more biased, but that is not what the study found on the various particular biases that it measured, only on the meta-bias of the bias blind spot (and even that is iffy - more on that below). Previous research has generally found that smarter people are either less biased or equally biased, depending on the bias; I don't know of any cases where smarter people are more biased.

Did smarter people show a stronger bias blind spot in this study? The authors of the paper say (in the abstract) that the bias blind spot was not attenuated by higher cognitive ability, and "If anything, a larger bias blind spot was associated with higher cognitive ability." Presumably, "if anything" means that the association was weak and not consistently statistically significant across their various measures. Otherwise they'd just say that the bias blind spot was bigger, rather than not smaller, and if anything bigger. Similarly, in the passage that Robin quotes, they only highlight the novelty of their result by saying "the bias blind spot joins a small group of other effects such as myside bias and noncausal base-rate neglect in being unmitigated by increases in intelligence." I haven't read the paper yet (I can't find it online), it sounds like it only provides weak evidence for a positive correlation between cognitive ability and the bias blind spot.