I'm curious if this is not only an effect, but also a cause. If the news reports that it is unusual for women to be in computing, doesn't that in a small way reinforce that message within popular culture? Newsweek should know better.
Isn't that called propaganda, and is the job of the government and ad agencies? (And they've both certainly done it successfully for plenty of causes they've decided were important.)
Journalistic integrity is important - even if it goes against your social cause.
This is a very common complaint about journalists, that by reporting on it, they are causing it. It might be a valid complaint, but any attempt to fix it makes it worse.
The whole question of media bias really comes down to the bottom line. If a format of words plus carefully chosen images favored traditionally conservative causes (which for the most part they don't) there would be widespread complaints about right wing media bias. AS it is, I think there is very little remanent of journalistic ethics in mass media.