It's not quite a total replacement for a natural womb (and the Nature article only uses the word "womb once, in the abstract), as it can't grow a fetus from an embryo; you have to start with a pre-incubated fetus that already has an umbilical ford to plug into and a strong enough heart. But even though we won't be growing test-tube babies 100% in-vitro with this thing, it is a major advance that could significantly push back the earliest time at which a premature baby could remain viable with artificial incubation.
It's not quite a total replacement for a natural womb (and the Nature article only uses the word "womb once, in the abstract), as it can't grow a fetus from an embryo; you have to start with a pre-incubated fetus that already has an umbilical ford to plug into and a strong enough heart. But even though we won't be growing test-tube babies 100% in-vitro with this thing, it is a major advance that could significantly push back the earliest time at which a premature baby could remain viable with artificial incubation.