I have not read the whole thread, so this may have been mentioned before. When I was in an adolescent unit for 'emotionally disturbed adolescents' way back in the mid- 1970s, there were a high proportion of teenagers in the units who were 'school refusers'. In fact, many of these children had a host of other problems which was obvious to anyone who spent time with them, but the label upon which they were admitted was 'school refusal'.
Indeed, although I was in there with an eating disorder, the boys who also had eating disorders were thought to have a primary problem of 'school refusal', however, that is another discussion
School refusal is a behaviour. Often it is not even a 'refusal' to attend school, but an overwhelming level of anxiety which makes it impossible for the child to go anywhere near the school, even when they want to attend. This was the case with my youngest. He wanted to attend. He did not want to miss school, but his anxiety levels were through the roof, and, unfortunately, still are through the roof over ten years later.
So, I would ask parents to stop using the term 'school refusal' to describe a serious mental health issue. I would also ask people to consider the impact that a child not attending school has on the child, on the family on siblings and so on. Surely we have moved on a bit over the past fifty years