[a_shovel]

The primary source cited in the article seems to have been wiped and replaced with "under review", but based on the article it seems it was primarily that if a trans kid is out at school, staff shouldn't assume they're out at home and so they should default to using the kid's legal name when communicating with parents. This seems like a good policy; if someone doesn't want to come out to their parents, it may be because they fear being beaten or thrown out of their home if they do.

"Schools transitioning children" is not a coherent phrase. "Transition" in the gender sense is not a transitive verb; transition is not something done to someone by others, is something that person does themselves.