What I've found interesting in thus series is how many children's behaviour could be changed by changing parenting
Yes, I imagine if I changed my parenting and allowed my dcs (both with SNs) to do pretty much whatever they wanted, there wouldn't be nearly so many meltdowns and screams and upsets. Of course, they'd be on screens/video games pretty much 24/7 then... but oh wait, there's this:
Anyone think that some of the kids - like 8yo Charlie - would behave better without watching so much tv and playing on Xbox all the time?!
And of course the eventual threads about children running around in public places and being noisy.
"Changing parenting" often means rearranging everyone else's life/schedule around that of the child with asd. As a parent, I do tons of things specifically because it helps ds1 cope better with the world around him. One would think this was not a new idea to you. 
Interesting that you seem to think that all children will present just like your child. I have two children with SNs, and they both present utterly differently. Techniques that work with one child are disastrous with the other. I'm surprised that the idea that "different children present differently" seems to be a bolt from the blue, tbh. 
And anyone watching those programmes that isn't aware that the way they edit it influences the viewers greatly is, well... quite frankly... pretty naive.