That sounds rather contentious. Is this a peer reviewed published paper, or based on such? The number of questions that raises is significant. If nothing else, how would they separate the co-morbidities that
do show on a functional brain scan?
How do you define 'damage'? Again, you need to remember that co-morbidities which are very varied but also very common among autistic people will show up on brain scans. How are these separated out? It's not like brain scans are so well executed and understood that we use them to identify autism. It's very early stages - if it could do this, we wouldn't need those awful diagnostic tests instead.
I think that's absolutely the case, and this is predicated on treatment allocation and resource scarcity. I don't believe anyone can claim to know the underlying pathology of autism, one of the problems are the wide range of symptoms and conditions that can underlie autism. There are indicators such as common gene's and conditions that are very prevalent etc. but understanding what they represent is not too advanced.
I know little of autism treatments (we don't have autistic people in the UK, only a very very long waiting list for the right to be called autistic!

I think what you're talking about is fairly cultural and national and will vary across the world. I presume that's US medical care.
Lack of clear cut knowledge in the field of autism will always present this sort of problem, many other illnesses and conditions in the past have suffered much the same until enough knowledge is accumulated and put across publicly. AID's would be a classic example, and one that (for all their self-denial) actually effected the normal population (you didn't have to be born with it, anyone could be infected) and yet politics enabled it to become a fatal epidemic.
I think you're again talking about the US experience? Communications on autism can vary a great deal from country to country. Can you explain what terminology you mean?
There are competing theories, but by definition there can only be one selected for use unless it's part of a clinical trial rather than standard treatment policy. But which one to choose? And that, as you rightly say is political as much as medical, like all other medical issues really, just one of the poorly understood one's still.
Everywhere you see a broken healthcare system (correct me if that's not so), and are rightly focused on poor end care through personal experiences (family), I see a new one that's behaving very much like many others before they were better understood.
But politics has far more to do with things than pretty much anything else - progress through priorities, and autism doesn't get a big political priority in many (most) countries.