Considering that between
997 and
994 of every 1,000 kids will be perfectly normally gendered there's an argument that refusing to raise a child in the gender they'd naturally have adopted as a part of their biological sex is negligent parenting that could possibly cause mental harm to the child.
When the percentages are so skewed in one direction, if you care for your child you'll play the percentages and raise them in the way that is most likely not to cause any kind of mental dissonance or alienation from other kids. But in this case personal politics has trumped the child's interest. Even the correct use of the term 'sex' rather than gender was ignored as it wouldn't have allowed for a grand statement.
If you could tell that a baby was trans when it was born you could save a lot of grief by raising it trans. But we can't do that, and it's incredibly unlikely, so trans people face a hard road growing up as something they feel they're not. But why push that kind of uncertainty on a kid that will 99.5% end up with no gender issues? What is gained by refusing to 'identify' their sex, and raise them without gender?
A baby isn't a political tool, it's a person.