If he hasn't applied any point to any job since they changed the attribute system then it already did completely reset stats. Before the change you applied points to the character, not the class so each class would be reset to 0/base when the allotment system changed.

What lvl is his archer? You aren't allowed to put points on until 25 or 30 so that may be why he is unable to add points to archer if it is below that lvl. You get keepers hymn after unlocking a job (for archer = bard) at lvl 30. Yes the Hym only gives you a fraction of your points back, but as I said if he never applied any points to archer since the system change, his points should be at the base anyway.