I agree LD has many causes but it is a form of neurodiversity. Neurodiversity simply means diversity in ways of thinking/brain operation so anything that affects that results in neurodiversity. This includes schizophrenia, depression, age, left handedness, dyslexia, brain injuries, epilepsy, dementia, cerebral palsy, genetic conditions (including Down’s Syndrome), developmental coordination disorder, adhd, autism, dyscalculia, other IQ, FASD, malnutrition, impact of drugs, etc etc.
The collective term for autism/adhd/dyslexia etc is ‘neurodevelopmental disorders’. That is very distinct from the concept of ‘neurodiversity’.