I expect they hope to poach from GSS or other 744 operators who pay peanuts. There are quite a few around since 744 BCFs are now the freighter of choice. VS have always taken experienced crews only onto the 744 as they don't base train on it. ZFT only. Seems like they're upping the requirements.
Interestingly, GSS have just advertised in Flight. Perhaps they're anticipating an exodus!