'Allows you to use the feat' meaning it allows you to use the Loyalty's Reward feat to provide a bonus to your followers, not gain that bonus as well. Like I said, the intent seems pretty clear from the flavour text.
Also, the ideas the creators had for that feat are quite clear, and pointing to a few well-known broken feats in the game and saying 'those exist too so I should be able to create custom feats on par with those' is silly.