"Sex is an inherent, binding property that always applies in binary totality to the entirety of a human organism from the moment of conception, and people do not 'become' male or female - they just magically hold this essential essence. Growing up as and existing within a female body is thus just irrelevant window-dressing - you already have a female essence and the concept of socialisation is irrelevant. Genetic mutations are deviations from the essential sex from which all humans are derived. What you are may as well be written into the stars."
Let's look at this:
"Sex is an inherent, binding property that always applies in binary totality to the entirety of a human organism from the moment of conception, and people do not 'become' male or female"
I believe this is true. That the destination sex of an embryo is contained already at conception. It is whether that pathway of development happens without deviation that may be an issue in very rare cases.
"they just magically hold this essential essence"
In the sense that their bodies are 'programmed' to develop a certain way if there are no medical issues, yes.
How strange to word it that way? You mock developmental biology?
"Growing up as and existing within a female body is thus just irrelevant window-dressing - you already have a female essence and the concept of socialisation is irrelevant."
There is no 'female essence'. At all. This sentence seems to come from some derivative of biological essentialist thinking. But it depends on how you parse this.
"Growing up as and existing within a female body is thus just irrelevant window-dressing - you already have a female essence"
There is no way to avoid 'Growing up as and existing within a female body', by it biological reality it WILL grow up as a female body without any special essence or any socialisation.
Socialisation is a reality and it will incorporate how an individual deals with the reality of their own sexed body. No matter what socialisation you have, it will revolve around your sexed bodily processes and how you as an individual react to them.
However, having a female body does not predestine a girl or a woman to act in a particular way. There will be huge overlaps though because of commonality of all people with a female body.
"Genetic mutations are deviations from the essential sex from which all humans are derived."
Genetic mutations that relate to sex are indeed deviations from the established standard for healthy body development for the body of that individual to operate at optimum health in ALL processes. Obviously reproduction is included here. It doesn't mean that those bodies are 'unhealthy' generally, but they may be. It does mean that some processes do not happen as they should if the development had been unchanged.
Those human beings are still human beings, and not one human being has working production of both gametes. Not even very few examples of chimerism.
"What you are may as well be written into the stars."
Cambridge dictionary meaning: If you believe that something is written in the stars, you believe that it will be made to happen by a force that controls the future:
So, yes in body development this is true. What is controversial about this?
Or... are we now delving into biological essentialism and trying to dishonestly tie this all together to mean that as a female person you are destined to act in certain ways.
Frankly, this paragraph is flawed and lacks coherency.
But apparently an 8 year old can understand it and explain it.