That is basically two teaching positions
The reason being given is the district doesn’t know the effect on enrollment that all the new charter schools that will be starting next year. It doesn’t mean that every school will be down by 50 kids and some schools won’t see growth but it means it is likely that school teachers will lose their jobs.
Another reason the schools might be told to under estimate is to make it easier to get rid of administrators, librarians or other teachers that speak up or question how things are going.
Don't think for a second that Duval County isn't ground zero for the privatization movement of public education.