Earlier quoted context omitted.
The term "bro" has been closely associated in the tech world lately with things like "brogrammer" culture. I don't know whether that was the intended reference in this case (though it seems pretty likely to me that something of the sort was on the authors' minds when they chose the name: why else would the term feel relevant?). But the real issue isn't "What did they intend?" in any case: it's "What impact might this…
What's wrong with gendered things? The programming language Julia is female, and nobody seems to have a problem with that. What's wrong with a tool that has a male gendered name?
Bro is associated with obnoxious, stupid, despicable, disrespectful.