I watched a video on youtube about schizoid personality. It seemed to be practically desribing a kind of autism.

Similar traits but with at least one clearly defined difference.

Those with autism often crave interpersonal relationships they just have difficulty expressing how they feel and coping with those feelings.

Clinically defined schizoid people have no interest in forming relationships of any kind.
They see everyone as either 'invisible' (they can't acknowledge they exist) or as a 'threat'.

You sound very professional honestly but I agree 100

I probably have that

If you read how schizoids describe themselves on Quora or Reddit, they often paint themselves like hardcore misantropes and borderline psychopats.