Yes and no. Yes, because it gives him a little extra AD boost through AS buff, which his passive converts to AD, and no, because he will never make good use of the on-hit damage. Even if he doesn't make good use of it, you can make good use of it, because Ardent gives you the same boost and many Enchanters have innate on-hit damage. Getting Ardent for the stats only isn't a bad thing anyway. That extra heal & shield power never hurts, especially if you plan to get Redemption and Ardent has good synergy with Athene's.