Okay, um, the way it is framed isn't ideal.
However, whilst the term "immmoral" is manifestly incorrect, the general premise to think very long and very hard if you learn at an early stage about a severe genetic defect, is true.
Trust me, all the hope, kindness and support in the world will not make up for the crushing, relentless and prolonged burden on at the very least the parents and siblings. With the best will in the world, society is also cruel to people with disabilities.
I would not wish the choice on my worst enemy.
And this is not the same as discriminating against people with disabilities.