Sam2 -“Health: What does a “school being run according to Halacha” mean?”
It means simply they don’t allow things in their school to occur which is Keneged Halacha. As opposed to YU. Look at Jothar’s post for examples of these.
Defending YU with – e/o knows there are Frei Yidden that go there isn’t an excuse why the school lets them do what they want!