autistic people often have an uneven weighting of skills. this means that it is unreasonable to judge us on one skill based on how well we can do a different skill. even if the skills seem related.
I have gotten an A on every oral presentation I’ve ever done. I also can’t use the phone, am drained by social interaction, and have days when I can’t talk at all. I can read the body language of my dog but not the body language of most humans. etc etc
autistic people also often have different abilities on different days. abilities and needs fluctuate from day to day, so someone can go from being able to do a task yesterday to not being able to even start it today.
TLDR; needs, skills, and abilities are variable when it comes to autism. if someone says they can’t do something, trust them