The article doesn't equate those "power poses" with masculinity, just testosterone (and it's the professor who claims this, not the author).

It's the use of the word "dignity" that upset me. Dignity is a dangerous word to use in an article full of gendered euphemisms.

I think you misread that statement. She's saying that by doing the power pose, she felt ridiculous (lost her dignity) but was able to convince the cleaners to get her blouse done faster.

If you actually read the article linked in the sentence you posted, by the same author no less, you'll see that her statement has literally nothing to do with dignity being just for the masculine, or picking up dry cleaning not being masculine. Furthermore this is a general audience article in Slate - not exactly the "tech community". Everyone uses smartphones these days (for a suitable definition of everyone).

jedanbik, it sounds like they're becoming more successful at dry-cleaning pickup by their "power poses". It reads to me like there's a joke about having a difficult time picking up dry-cleaning.

It is an odd sentiment. She thought the "power poses" were undignified!