Nah, Neurodivergence has always existed but the structure of our society and the degradation of our communal nature in favor of hyper-individualist, rugged capitalism has destroyed what alternatives we used to have access to that allowed us to live our lives without unnecessary burden. Our day-to-day lives in this era are so controlled by arbitrary, outside forces in such a way that doesn't allow for any wiggle room anymore that those of us who struggle to fall in line are unduly punished by the strict adherence to the system.

The structure of life was fundamentally different during pre-modern times; they had access to communal resources (i.e. the Commons) that just don't exist today. They could structure their lives in ways that weren't hindered by their neurodivergence; they could take an alternative to reach the same goal. In feudal times, the ruling authorities just kinda let communities run things how they wished with little oversight so long as the towns were more or less were not breaking any laws set by the ruling authority and were paying their taxes. There wasn't tech or corporatized structure to micromanage every individual action of the people under their purview. There was wiggle room at the interpersonal level that allowed people to work out how to solve disputes and strike deals between themselves without needing to involve a higher authority for permission to do things the way they were most comfortable doing it.

Feudal life was a lot more complex and intricate than people give it credit for. It wasn't perfect, there was definitely overt oppression happening during those times, but it did have its benefits, not from the system itself but from how that system wasn't as controlling over our day-to-day as our current, corporatized society.

This isn't even to mention other, non-European societies and their fundamentally different structures that sadly were wiped from the map due to imperialist conquest.