I don’t think the article says they wouldn’t *treat* him but that they wouldn’t authorize his getting an advanced, probably experimental, treatment.
I don’t understand why the parents couldn’t just get permission to take him out of the hospital, then take off for Spain (or wherever they thought they could get help).
Why should the parents have to get permission from the government to treat their own child? This is a case of a nanny government thinking that it knows better what to do with the child that his parents.