My son is severely dyslexic. He has no problems with using preferred pronouns. Probably because having grown up with a hidden disability he is always conscious that you need to be respectful to the person, and never pre-judge ,or decide on abilities, or any other factor, until you really know and understand the person.
I think attributing misunderstandings to anyone who is neurodivergent indicates an inability to recognise that people who come under this umbrella are as different from each other as any other group of people, and using their disability as a way of trying to project your own prejudices onto a subject is about as low as you can go.
If they have problems with pronouns perhaps it is because the people responsible for helping them to understand are failing to do so. I wonder why?