I like to quote Jamie Knight who says, "if you've met one autistic person, congratulations you've met one autistic person".

The problem I am highlighting is that someone's condition is not the only factor to consider. It's a trap lots of UX people fall into when they get feedback from 3 people of a particular demographics and then extrapolate a whole audience sector from it.

The thing with barriers is that they are not aligned just to specific conditions. Barriers are shared be people of many demographics, sometimes permanently and sometimes the barriers are transient, but the are still there. So if you identify barriers and the needs and strategies that overcome them, then you have a much more relevant and experience centric perspective of the design or a product.