So it seems like development of the first neuron would be well before that, and not a very practically-useful line.
https://en.m.wikipedia.org/wiki/Development_of_the_human_bra...
The analogy stems from an instrumentalist view of what it means to be human and the expectations parents have that children are for their own pleasure. IE: a down syndrome life isn't worth living because such a person can't be a meaningfully productive member of society, or a down syndrome child isn't one I want to have because of the long-term burden I will have to bear.
It's not mental gymnastics to make that connection. The only reason it isn't obvious is because abortion is a taboo subject.
FWIW a 10 week old fetus is a lot more than a "blob of cells": https://www.youtube.com/watch?v=sivegxcp2Bk .
Also, there are a multitude of reasons why a couple would want to terminate a pregnancy for a genetic anomaly, from the social burden to the financial burden or the notion that their child with a congenital condition will not lead a life they deem worth living. At this point, when the fetus is not a person just yet, it's their choice to make.
Would you have a child knowing they'd be condemned to a premature and painful death?
It's ridiculous making such mental gymnastics to stretch this article in order to blame "the West".