“According to the article, the teachers still have chairs, just not desks or file cabinets.”
That is just more proof that the principal is insane or stupid. Is the sitting, or the desks the cause of problems? She says it is sitting but throws out the desks. Filing cabinets? That would mean she is both insane and stupid. Most school districts mandate personal files on students be kept under lock and available at a moments notice for the teachers.
That's my interpretation.