No unfortunately it doesn't most people just assume he has very little understanding of anything. He doesn't need a sunflower lanyard because his autism isnt hidden, hes an adult size, bigger than most, his autism is loud and flappy with lots of squeezes and various noises, growls and hums. If he's upset he doesnt just cry he wails, it's gut wrenching and we dont always know what's wrong it could be a nightmare, tooth ache, head ache, a dead leg......
We did have one amazing slt who introduced aac (it's only as useful as his understanding or his want/ understanding of communication). She told us to always assume competence so every attempt to communicate, every button pressed has meaning and should be acted on. I took this to heart and that's what we do. It has opened a different world. He does have some amazing skills- he can read nouns in other languages and match them to the correct pictures/ words. I cant do this, can you? Most people cant but it isnt really useful and knowing what some of the words are doesnt mean he has an understanding of them.
We have furniture attached to walls, a sensory room in the house (we took extra out on the mortgage when we moved to pay for it), we have special doors like big child proof gates, an adult special swing in the garden, visuals all over including the toilets in hope/ to help him/ encourage him to try himself, we cant attend autism groups for teens because he has the wrong type of autism....
Being profound doesnt mean he doesnt have a personality, hes incredibly loving, kind, funny, engaging, hes great company. He can do some amazing things and I'm sure he understands a lot more than what people give him credit for. He has lots of needs but I dont want to outline them here, you can guess most of them.
He could never be responsible for anyone else because he wouldn't understand, he couldnt even meet his own basic needs in any way or articulate them, he wouldn't even know they needed to be met let alone describe them.
He requires waking care because he doesnt sleep much. 1:1 inside and 2:1 in the community or when out with school. We had pa's but there was a safeguarding issue this year and they were investigated by lado, then fired and put on the dbs check list so they cant work with vulnerable people ever again. We only know this because of cctv my ds couldnt tell us and we wouldn't have known too. No behaviour change either. Hes approaching adulthood. He requires more help now than when he was a baby or toddler and it just gets harder. The future scares me to death.
My friend has a child who is now an adult, he was sectioned and placed in a group home miles away - he has limited comms too. She faught to get him moved closer to home. Its now come out that there was abuse carried out in the home while he was there, she has no way to know if he was abused. She will never know what happened to him.
There is a world of difference between the above and some of what other posters have described as high support needs and thats just some of the practical stuff (I know you haven't said your child is profound).