Need more advice about autism in children?

Can I please ask a question about autism in children, I was trained that autism is invisible, you cannot see it which is why it is hard to diagnose, but I have a friend who works as a support worker for disabled adults, and she is constantly telling my my child’s autism is not as severe as the people she works with, but I do know disabled adults and children who are deaf, and other major disabilities some get diagnosed with Asd, but I wonder is she just thinking this because she is blind to it and thinking those people she works with she associated their disabilities with Asd how people should look, I find it very difficult at times when I feel she is advising me, my lil boy doesn’t speak and uses pecs but she feels his needs r not great at all, I feel she is blind to his appearance and doesn’t understand what we go through