PIP CHANGEOVER FROM DLA worring developments

Hi spoke again to DWP regarding my sons autism tonight.Again I do not understand, so any help would be great . summary below

Son diagnoised by lorn wing herself (wonderful lady)

Son then has diagnoises of autism and severe communication disorder.years of specialist appointments etc

 Son gets DLA and after DLA  tribunal ruling .JUDICAL REVIEW FOR HIS EDUCATION. court of law except he is autistic plus other disabilites  .

change of law from DLA to PIP form recieved

major fact :our son does not talk to people

Phoned atos to discuss

ATOS STATE"WE DO NOT HAVE THE INFORMATION THAT IS AUTISTIC "

I ask what information they have , they said they were no made aware by DWP that he has autism and severe communication disorder.

I asked what information they have?

14 pieces of evidence  (would not confirm exactly what has been sent by the DWP) but did not have diagnosis ,  tribunal order, etc

So atos put me through to the DWP again

DWP stated that it is not required as part of the assessment  for the assessor to know his diagnosis .Assessor does not have to have mental health trainng/autism training .

WHY? how can you assess without facts?

I  am awaiting surgery and feel this is completly wrong , how can i ask for a reasonable adjustment if the person making the decision is not made aware of his needs, diagnosis etc.

Is equality law dead? where are my sons rights , where do we we do nex?