I'm also wondering if he was being abused at school, or by another caregiver.It's from thirteen years ago. I don't think we need to "watch this one" for skeletons.
From the article, it seems like Sky may have been stressed by the circumstances around the parents' divorce; maybe they were fighting and/or there was domestic abuse and they didn't realize he understood it? My impression was also that he was having more frequent aggressive episodes and meltdowns at school compared to at home, so if there was abuse happening maybe it was at school.
I also feel like the article might not have the best understanding of autism since they always referred to meltdowns as "tantrums."