There can be a lot of overlap but here's how I see it:
BPD has "chronic feelings of emptiness" and "lack of identity" as a prominent symptom. As such, they're not going to have the special interest or hyper fixations you would see in most autists.
Since they have no sense of self, they're not going to be able to fixate on anything long enough for it to be a hobby, passion or fixation; everything that they're into is going to be very shallow and highly dependent on others around them. They also tend to be chronically dependent on being in a relationship, and as such, will hop from relationship to relationship (unless they snag a spinless wimp and get him to put a ring on it like Anisa did. In that instance, they may be content with one (primary) victim.)
An autist, most of them anyway, can often be defined by their deep-seated special interests and hyper fixations. Chris chan and Sonichu are a relevant example.
Autistic people also tend to have a lot of trouble fitting in because they can't really blend in socially to any degree, they're not able to "chameleon" the way BPDs do when they are snaring their next victim gf/bf. They also tend to struggle to enter in to and maintain relationships due to their social issues. Chris chan is a relevant example, always. Lmao.
Autists will also have sensory issues in most cases. A BPD can try and imitate this, but it's gonna be shallow and hard to maintain if the sensory overload isn't real.
TL;DR: Anisa lacks the special interests, hyperfixations, relationship/social struggles, and sensory issues we would expect to see in an autistic person.
