That feels like too far in the other direction. Rather than open internet access, there should be a district-wide intranet or at least just a proper whitelist of allowed sites, but of course that would require a proper IT department and would be too costly for most schools.
So, as I understand it, and I don’t, 5D is just fancy marketing due to the really weird properties of the crystals used to store the data in. They are just calling properties of the crystal, dimensions.
I found the wiki page on it https://en.wikipedia.org/wiki/5D_optical_data_storage
According to the University of Southampton: