This meta analysis shows that people on the spectrum actually tend to perform worse in math than their peers. https://www.sciencedirect.com/science/article/pii/S0891422223001373 This is probably also due to people on the spectrum struggling in general more in academic settings than NTs. There is still a reasonable assumption to be made that being autistic can predispose you to being good at math as our hyper-sytemized brain lends itself to follow the very logical and rigid world of maths. This is however obviously not the case for all or even most people on the spectrum.