Autism is a medical label given to a specific set of symptoms as perceived by others.

The answer to this is neurodivergence, which is how we identify ourselves and its much more inclusive.

https://en.m.wikipedia.org/wiki/Neurodiversity

Both terms can be used though. I often say i am autistic as a fully embraced part of my identity, but much of that is because most people have never heard of neurodivergence.