Graphene Water Desalination: Osmotic pressure of sea water is 24 bar period, so how come the MIT researchers claim that this can be done at a lesser pressure?

After pondering the MIT study previously mentioned, I started thinking that the osmotic pressure of sea water is 24 bar, so this means to reverse the process and obtain fresh water a high pressure pump must exceed 24 bar to produce fresh water regardless of whatever osmotic membrane is employed.  In other words, 24 bar is still required, it is the flux or water flow through the graphene 1-atom thick membrane that increases relative to existing RO membranes.