The first youtube video DS watched was age 4. He was playing very repetitively and showing him videos of people doing different things with train sets did inspire him to try some different things. That was an autistic trait (which I hadn't realised at the time) and a youtube video seemed to be a good idea to diversify his development a bit and it worked well.
Unfortunately, everytime I tried to play directly with him it triggered a huge, screaming meltdown tantrum because I did it all wrong and didn't subconciously interpret the correct way that he wanted me to play with him.
Focused, controlled use of screen time can be very helpful for autistic children. The autism is there anyway and often conventional parenting approaches can be more of a hinderence than helpful.
Media formats such as videos can make information much more accessible. DS rarely watches conventional TV because it's not niche enough for his interests. Youtube certainly needs a lot of care, but it's also a gold mine of niche content created by people who love niche content. To meet DS's thirst for knowledge through books would be expensive if he wasn't too dyslexic to find trawling through that density of detailed text a slog. His teachers have always been amazed by his general knowledge, and that was learned from videos.
Hyperfocus can mean autistic children spending longer than is typical on one activity at a time. DVDs got him and me through a difficult sibling pregnancy during a long difficult winter which reduced practical options for getting out. At 2, DS would focus on the whole Thomas DVD. With hindsight, it makes perfect sense that he found it distressing to have the DVD interrupted because his autistic perfectionism likes things to be complete. All I knew at the time was that I had a toddler that was hard work, and it was very difficult to make him go from one thing to another. Again hindsight- transitions are a common difficultly for autistic people.
With hindsight, yet again I can recognise why places like the supermarket were such hard work. Why outings to "fun" places like soft play always concluded in tears. He's now an articulate teenager and some common meltdowns that mystified me at the time have now been explained such as him associating place name A with place B for a logical reason, and I'd be bamboozled why we turned up to a lovely park and he'd be in a foul mood after initial excitement not knowing that he perceived that he was in the "wrong place"
Excessive time spent without communicating and developing language is of course harmful and yes screens can be a symptom of that. But the correlation that families with autism using screen time to improve family life more than average levels is not the same as causation. There is nuance. Parents can use screens as a tool and not neglect other areas of development. I spent my youth ploughing through books which share the social and activity downfalls of screen time. Not all books are worthy and enriching, but I will grant that they tend to be better for stimulating multiple zones of the brain. But society has a fairly crude categorisation that reading on paper is better than reading on a screen than doing other things on a screen.
As a teenager now, he does use screens a lot (as well as maintaining practical hobbies and a couple of sports) because he exceeds his social quota getting through school life. Being autistic, care was needed about chosing a school that would not overwhelm him into school avoidence and the local catchment school was not it, so the friends that he does have are scattered around the city, not local for casual hanging out. He's currently only interested in gaming online as a form of socialising and it frees him up from some of the pressures of in person socialising such as faking eye contact. That lower pressure helps him recharge enough to survive school life, and he needs to do well in school to get a job in a niche autism-friendly profession where he can utilise his strengths.
Autism is often accompanied by other conditions such as dyspraxia, hypermobility, dyslexia and sensory issues that will affect what autistic people find pleasurable. Again, that can increase the appeal of screen time over other activities.
If autism is the real concern here, faster, more proactive pathways to diagnosis with more support than a handful of flyers is the real answer, not insinuating that parents broke their children by trying to cope in harder than average circumstances and scapegoating them.