The ipad is contributing to the problem. Some children's brains cannot handle the over stimulation. Studies have shown that the rush some kids get from active games on ipads and video game consoles trigger their flight ir fight hormones and put them in a state of hyper arousal. Its hard to get them back down from that and it causes the issues you are listing.
My 11 year old had this issue when he was 4, addicted to his ipad and would have melt downs. It took a long time for me to realize that his ipad was the underlying issue. We took it away and it took him months to adjust.
He also loved video games, but this behavior always resurfaces when he uses his PS4. We went through cycles of taking it away, he would improve in all aspects of life than we would reward him with it. He would just slop back to the aggressive and bad behavior so we just took it away for good. His brain just can't process and handle the stimuli.
There is a great book called Reset Your (Child's Brain: A Four-Week Plan to End Meltdowns)[https://www.amazon.com/Reset-Your-Childs-Brain-Screen-Time/dp/1608682846] This helped me a lot with understanding all of this. Good luck op, it is not to late to reverse this.
Congrats on your progress. But why not get the extra support for a bit anyway? It's normal for there to be ups and downs.
Also, it may be interactive screens and not just porn. The first part of this book is fascinating and relevant to everyone who struggles with internet porn/videogaming/social media. http://www.amazon.co.uk/372/dp/1608682846/ref=sr_1_1?s=books&ie=UTF8&qid=1441320888&sr=1-1&keywords=reset+your+child%27s+brain
I haven't been evaluated for schizophrenia. That is however also a neurological malfunction and just like autism is diagnosed through symptoms. If autism (and schizophrenia btw) is characterised by brain inflammation then it's possible that the symptoms that lead to an autistic diagnosis could have multiple causes. For classically autistic symptoms (the real tantrum throwing possibly non verbal autism), I would say it's most likely a neurological metals poisoning. However for someone like me (who is mild) I would say it might be a mix of things. I find it extremely interesting when I have said to the countless doctors and psychologists that my gut burns and my head goes even fuzzier when I look at screens leading to lasting fatigue, cognitive disability etc....and they just look at me with a blank stare. No one knows what's going on. I recently found this:
https://www.fonezie.com/electronic-screen-syndrome.html
https://www.amazon.com/Reset-Your-Childs-Brain-Screen-Time/dp/1608682846
Could the cumulative effects of screen exposure cause chronic fatigue and many of the symptoms of mild autistic spectrum disorders? Or does screen exposure simply make the already preexisting autism worse?
By the way the aluminium hypothesis is no way a bad one. This book is one of the best I have ever read.
https://www.amazon.com/gp/aw/d/1603588248/ref=tmm_pap_swatch_0?ie=UTF8&qid=1624160194&sr=8-1
...As for your comments on the strategies needed to treat but never fix or "cure" a neurodiverse brain, I take this view: I truely to the bottom of my heart do not believe a brain can be born broken. The view taken that pain and discomfort and chronic inflammation does not have a root cause but is simply how your brain is wired; I don't believe that. There are people who literally have had half their brain physically removed and the remainder rewires itself for the individual to live a normal life.
Strategies to reduce autistic symptoms are fine but understand there are now massive industries popping up to cater for the explosion of people on the spectrum. None of that is normal.
That's why I don't take pharmaceutical medication to complicate symptoms. I'm in the process of one by one knocking out the things that could be causing this.
Netflix is ok. What's interesting is that a Psychiatrist has been gathering data about interactive screens causing all sorts of problems in young people. She also does a reboot of sorts, and has seen many behavioral problems get better or remit with an electronic fast.
Article by her - https://www.psychologytoday.com/blog/mental-wealth/201508/screentime-is-making-kids-moody-crazy-and-lazy
Her new book
My thoughts - I wouldn't become obsessed about screens, but I would really try to replace screen time with other activities.