[Lemontology]

The [empirical] study linked in my comment found that only 6-15% of Autistic people actually have a genetic disorder like fragile x.

[empressplay]

Diagnosed, perhaps. Something like EDS is also a spectrum, you can have mild forms of it and not have them be enough of a concern to investigate, but obviously any amount of collagen disorder is going to have wide-ranging systemic effects.

There are a number of current studies looking more specifically into collagen disorders and autism and I expect them to find a broad correlation between the two.