I can't talk about Stanford, but STEM-related jobs (including software engineering) certainly seem to be full of people with ADHD, autism and related "neurodivergances"

I wouldn't be surprised if most of these Stanford cases are people gaming the system. But I would be equally unsurprised if screening all students of elite universities revealed that over 50% of them had some condition listed in the DSM-5, with clear correlations between condition and field of study

I know you did /s but in public school gifted programs here the gifted kids have IEPs (a document defining their Individualized Education Program) similar to what is required for special education kids with disabilities.