How does this work for other languages?
I'm not convinced this would work in the long term. Short term in english possibly, but if you are reinforcing gender stereotypes through physical appearance / culture you are just reintroducing that bias without having words for it.
All this study is showing is a lingustic trend too - and thats an important flaw with what they are saying. Its not showing how people respond to a physical person.
I also don't think it addresses the dehumanising nature of language when you start to refer to woman as 'childbarers' or 'cervix havers'. Which might have a significant impact on the status of women in society as being seen as a commodity rather than human.
What you might gain on the one had you might be taking away - and taking away more in other areas - on the other hand.
Its an incredibly narrow study that taken in isolation needs to be taken with a massive pinch of salt.