I think the article might blur the line in some places between things that really are invisible barriers to hiring women and some that are just about hiring who you want.

For example I could totally see the point about making sure at least one woman interviews every new hire to be a great policy. You always want to feel like you will fit in wherever you work, and being a woman and then seeing only men can feel a bit disconcerting and alienating. However I am lucky enough to work with a lot of great female coders and for some of them free chips and beer (and especially whisky shots!) would be a great perk.