I've heard more than one fellow programmer joke that we couldn't do our job well without being a little autistic. LOL
Over the past 20-25 years they have expanded the definition as to what is autism. It’s now not one disease showing one set of characteristics it’s now a “spectrum”. So naturally there would be an increase in the number of autism cases. What I haven’t seen are any statistics where that is normalized out. Without doing that it’s difficult to honestly say if there’s been an increase and if so by how much.