I can't see the video either.
But from reading the text, I wonder isn't part of that increase due to the fact that it's now diagnosed better than in the past?
I knew a woman, now deceased, that I met when she was in her 60s, about 30 years ago, who I immediately suspected was autistic, so much about her reminded me of an autistic man I'd worked with. But her family said she had a fall as a baby and suffered brain damage. I accepted that at the time, but since then I've read that a lot of older auties (and auties now deceased) were thought to be brain damaged, and that it was common for there to be a family story about what might have caused it, because people didn't realize it was autism and that it might not be obvious yet in an infant, so they assumed it was something that started because of an accident. I still suspect this woman I knew was autistic, just never diagnosed properly.
I was not diagnosed for Asperger's (still am not) as a child, but I was a child long before the diagnosis was available.
Now it's diagnosed more often. Makes sense. I don't see that as necessarily an increase in the incidence of autism as it is an increase in the success of diagnostic protocols and more education among professionals, including teachers.
But it is interesting that there might be an intestinal flora connection...wish I could see the video.
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Female
INFP