Army application

My oldest son is heartbroken as his online army application was stopped dead in its tracks last night. In the medical questionnaire it asked if he had been diagnosed with "Autism or Asperger's". He honestly answered, Yes, and so computer promptly threw back a rejection message - permanently unfit to serve on medical grounds.

He had been advised all along that autism is not a barrier to serving in the army. In fact, the army recruitment website does not list autism spectrum conditions among the medical reasons for rejecting applications.

How on Earth can the armed services get away with an unadvertised blanket ban on all applicants with ASC; does it not fly in the face of the Equality Act? Is there anything that can be done in this situation, please?