However, I find the basic idea that "women may be perceived as competent but unlikable or as likable but incompetent" in the workplace to be completely true. This idea does not carry over to other underrepresented groups, I think. For example, would you say there is a similar double whammy for black people?

I'm not saying that the situation is the same for every underrepresented group; I'm saying that if the article were to advise any other underrepresented group in a similar way it would be denounced as discriminatory.

EDIT: I have no idea why parent is being downvoted. He/she raises valid questions.

My point was that I think the issues with women in technical workplace are somewhat different from those relating to minorities. You, of course are getting hit by both!