The wording actually given in this quote avoids the problems discussed by Will_Newsome and jimrandomh: admitting error clears the score, resets it to zero. If you were wrong, this wipes out your negative score, for a net win; if you were right, it wipes out your positive score, setting you back.
True, but clearly unintentional.
Take off every 'quote'! You know what you doing. For great insight. Move 'quote'.
And if you don't: