I've heard from a clinical psychologist and also from a bunch of people on the internet that the symptoms of BDP are often presented by (especially female) traumatized autists, and they run a high risk of being misdiagnosed with BDP. and based on the diagnosed (entirely AFAB) autistic people I know socially none of them show any signs of being unaware of or unmotivated by social validation.

Also there is a high overlap between autism and ADHD, many people have both characterizing them as opposite ends of a spectrum sounds like a stretch.