People with autism are, indeed, often treated with any of a variety of different-purpose drugs, depending on their specific symptoms. If an autistic person suffers from e.g. severe anxiety, or violent outbursts, as a result of their condition, they are treated much the same as a non-autistic person with the same symptoms. Per your study, more than a third of autistic children aren't treated with drugs at all. People, as you say, are different.

If you want to make the argument that some of those symptoms (whether autistic or not) would be better treated with counseling than medication, that's reasonable. But I don't see how you can look at that data and conclude that all autistic people are treated exactly the same.