I have issues with this. Based on experience. My nan got pregnant by surprise in her 40s. This impacted my aunt in different ways. Even from just kids asking if her mum was her grandmother. Especially in her teens. Then nana died when my auntie was relatively young. However, my auntie would much rather be born or not.
I have issues with surrogacy, in general. I know it hasn't been officially confirmed this is how she had the baby. But presuming it is, even if the women carrying the baby was more than happy to do so. Lots of surrogate mothers are doing so because of poverty and yes, renting a womb feels wrong.
I do think much older parents are potentially, putting alot of strain on their kids. This includes older dads. Dad's in their 60s & 70s are impacting their kids. Not just that they are more likely to die while the child is young. But some sort of care is possibly needed, not by the kids. But having a much older adult who needs care, in the home impacts everybody. Even if it's just because that parent can't do much with the child or plans have to always be made around a frail parent. Lots of kids go through this when they have younger parents, who become unexpectedly ill. But I wouldn't have a child knowing this is far more likely, to happen whole the child is young. We care for family because we love them, but that doesn't make it easy or lessen the impact. This goes for older mothers as well.
But, while it's unfair, a mega rich older parent will have less of an impact. NC has the money for nannies to help her, so a normal 50 year old mum may find it knackering. NC, as the facility to reduce that massively. If NC got dementia in 10 years, the child isn't going to become a young carer. Yes it will still impact the child, but to a lesser extent, than it would if she was a normal earning person.
While I am uncomfortable about the situation, I feel the situation is different due her money. That's why I disagree with her statement about science. It's science and money that enables her to do this. The fact that she doesn't appear to get this is because of her privilege. I very much doubt if she had earned 25k a year for her whole life, that she would be doing this at 50.