I seem to recall DHL having similar requirements very shortly prior to asking OAT to send them low hours grads. That seems to have gone OK.
No harm in asking - publicly stated minimums aren't always what companies actually use for the 'right' candidate. However, in deciding the current minimums they do need to consider the spread of experience across the board, and most will avoid having too many newbies in relation to the rest of the crews. DHL may just be in that position at the moment.