Gender neutral parenting is "we will not reveal the babies gender or address them as him or her." I get where these ideas come from. Parents want to give their children the freedom to choose for themselves, I understand this. Problem is here, Gender is not equal to sex. Gender is something someone decides themselves. Sex is something biological. It is a fact, you cannot deny it. Someone is born as a boy or girl. There is nothing wrong with addressing your child as the sex they were born with. It becomes a problem, when you enforce the stereotypes and gender roles that supposedly belong to this sex and deny them the right to express themselves in anyway that does not fit the norm. When your child is exploring their gender, you should give them the freedom to do so. Part of a child's journey, is to explore their own identity which includes their gender as well. If they decide what gender they associate with, it is your duty as parent to support your child in this decision and address them with the respected pronouns.
So yeah, parents shouldn't be enforcing ideas about sex and gender. But they shouldn't fall into the other side of extreme either. There is nothing wrong with saying that you shouldn't force stereotypes/roles and you let your child be who they want to be. If this what people mean with gender neutral parenting, I am all for it. But going into the extremes by saying, this child is neither a boy or a girl, as example Grimes was trying to do with their newborn son, could just as well be damaging to a child. Especially when today's society isn't exactly accepting to minority groups.