This must have been noticed many times, but new to me.
It's striking the overlap between the symptoms of some autism categories and PCS. "Sensory overload" in particular, the problems with noise and light and being overwhelmed in busy places, leading to anxiety and agoraphobia type behaviour. If I were a child I'd be crying a lot and having meltdowns in public.
I have a close relative with this type. I wonder whether birth head trauma could be a factor in a sub category of ASD? It wouldn't show up on scans of course.
I checked to see whether induction was associated with higher ASD and it is. Only one analysis of studies, but still. My child was induced when the birth process was already underway - madness in my view - and I had an extremely rapid birth as he battered his way out of my body. It felt like being eaten alive by a wild animal, and he can 't have enjoyed being rammed out so hard head first either.
No proof, just a hypothesis that it might be a factor in some cases. But a striking overlap though.