I imagine the contention is about the use of the word 'mother.'What was unclear about that in the article?
If man A and woman B contribute sperm/egg in vitro and put the quickened egg into person C's womb, who is The Baby's Mother? B or C? Is C a mommy or just a hostess for the parasite for a few fiscal quarters?
When I see a headline like that, I just read the article. And in doing so, I see clearly that by "mother" they mean a woman's DNA.
I find this quite interesting to say the least.
But on the topic of whether a womb is needed, there is this, which is also interesting as well as a bit frightening. https://www.theguardian.com/world/2002/feb/10/medicalscience.research