I understand if someone elses embryos are implanted into the mother then it is done under a safeguarded contractural arrangement. Certainly the original “parents” have no moral or financial obligation to the child. The “mother” is the woman who gives birth to the child.

The embryo donor(s) in that instance give consent for the embryo to be implanted. The difference here is that one of the biological parents did not consent, although it would appear that he consented for the eggs to be fertilised with a view to being implanted at some stage in the past. It appears that there were therefore two stages of consent to be given. Interesting when you consider that in the normal act of intercourse there is only one stage of consent. However that consent is given in the context of an ongoing relationship where pregnancy will occur ( if its going to at all, within about 10 days of the event).