I've talked about it with my parents they are 70ish and teachers and they both say in the years they worked there weren't as many kids diagnosed with some condition

I can almost guarantee they worked with tons if autistic kids, they just didn't know it.

Why do I say that? Because I've had multiple teachers tell me that my diagnosed AuDHD kid isn't autistic. Clearly, the teachers who only see the kids while masking and yell at them when they act out would know better than a trained professional or the parents who see them when they feel safe and don't have the energy to mask anymore.