I don't think Ingles has suggested that school should breach confidentiality or divulge information on a family situation off their own bat.
However, it is perfectly possible for the family to give the school permission to give out information about an SN child's actual condition and how this might affect the other children/useful ways for them to cope etc.
E.g. "T has Aspergers. When he does X, he is not trying to be nasty on purpose; it's because he sees things in this way/finds it difficult to deal with this type of situation. If you notice T doing X, then it's a good idea to avoid doing Y (e.g. getting too close) as it might make him feel threatened".
If this is done, it can make everybody's situation easier. The other children would feel both more sympathetic towards X and be safer, because able to avoid potentially dangerous behaviour around X. And they would learn something that might make them stop tut-tutting around SN children in the supermarket years later. On the whole, people tend to be much less fearful and judgmental if they understand something.
My dd has a physical disability which does impact on the other children's lives, and it would be foolish for me to pretend it didn't. She basically couldn't get through a school day without the other children's help and goodwill. What I have done is to give each new teacher a letter, detailing exactly what I would like the class to be told (in the absence of dd). Things like "X can collapse suddenly. It may look like she's putting it on, but she isn't actually. If it happens, then these are good things to do..."
This is not breaching confidentiality, as I decide how much information is to be divulged. Nor does it mean that I feel I have to let anyone in on the intimate details of my family life.
It was the suggestion of the school that I should do this (though they made it clear it was entirely up to me). It was a helpful suggestion.