It's called biology for a freakin' reason. And yes it IS "hard wired".
Facts don't care about your or anyone else's feelings.
The statement you quoted is my statement that I think the breadth of development that people attribute to some kind of "hard wiring" is far too broad.
If you want to discuss a specific aspect of biology you think is hard-wired, please describe what aspect you're talking about.
But, just as a general overview of where I'm coming from:
In a society where people don't have as easy access to automobiles or for whatever reason, steps per day are higher, will people's legs develop differently?
If, during my development, there's a lot of periods of hunger bordering on malnutrition, will that have effects on my physiology like relative ratios of organ sizes and BMI that persist long into adult life?
Am I really able to encourage development of my nephew's hippocampus with all these memory games?
Can a child surrounded by stress and fear develop a much larger and more cognitively involved amygdala, then? Or at least develop a "disorder" attributed to that structure?
A lot of what we "know" about social behaviors is because a developing human is surrounded by social behaviors to observe.
Much further back, recall we used to at least sometimes still use all 4 limbs for locomotion. A human body won't develop that way now because there's chairs to sit in and counters to do stuff on. Baby wants to just roam around on the floor. But no, we walk around them all day. We stand them up, bounce them on their chubby little legs, put them in the spring suspenders thing, encourage them to keep trying. We buy them miniature versions of chairs and tables to do stuff on. No matter how many times they fall out of the little chair, plop back they go with a kiss on the head.
The body develops like it is demanded and/or encouraged to.
A lot of this stuff unfolds over a couple of decades and not in any kind of strict order, either.